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Helps you find words for word games!

Twelve letter words that start with O

Twelve letter words that start with the O are helpful when playing a game like Wordfeud or Scrabble. We have a complete list of dictionary words starting with the letter O.

  • oafishnesses
  • oarsmanships
  • obdurateness
  • obfuscations
  • objectifying
  • objectivisms
  • objectivists
  • objurgations
  • oblanceolate
  • oblatenesses
  • obligatorily
  • obligingness
  • obliterating
  • obliteration
  • obliterative
  • obliterators
  • obnubilating
  • obnubilation
  • obscurantism
  • obscurantist
  • obscurations
  • obsequiously
  • observations
  • obsolescence
  • obsoleteness
  • obstetrician
  • obstreperous
  • obstructions
  • obstructives
  • obtusenesses
  • occasionally
  • occidentally
  • occultations
  • occupational
  • oceanography
  • oceanologies
  • oceanologist
  • ochlocracies
  • octahedrally
  • octapeptides
  • octogenarian
  • octosyllabic
  • octosyllable
  • odiousnesses
  • odontoblasts
  • officeholder
  • officialdoms
  • officialeses
  • officialisms
  • officiations
  • offishnesses
  • offscourings
  • oleaginously
  • oleandomycin
  • oleoresinous
  • olfactometer
  • oligarchical
  • oligochaetes
  • oligophagies
  • oligophagous
  • oligopsonies
  • oligotrophic
  • omnipotences
  • omnipotently
  • omnipresence
  • omnisciences
  • omnisciently
  • omnivorously
  • oncogenicity
  • oncornavirus
  • onomastician
  • onomatopoeia
  • onomatopoeic
  • onychophoran
  • oophorectomy
  • opalescences
  • opalescently
  • opaquenesses
  • openhandedly
  • operatically
  • operationism
  • operationist
  • operatorless
  • opinionative
  • opportunisms
  • opportunists
  • opposability
  • oppositeness
  • oppositional
  • oppressively
  • optimalities
  • optimisation
  • optimization
  • optometrists
  • oratorically
  • orchestrally
  • orchestrated
  • orchestrater
  • orchestrates
  • orchestrator
  • orchidaceous
  • ordinariness
  • organicities
  • organisation
  • organization
  • organoleptic
  • organologies
  • orientalisms
  • orientalists
  • orientalized
  • orientalizes
  • orientations
  • orienteering
  • originations
  • orismologies
  • ornamentally
  • ornatenesses
  • ornerinesses
  • ornithologic
  • ornithopters
  • orographical
  • oropharynges
  • oropharynxes
  • orotundities
  • orthocenters
  • orthodontias
  • orthodontics
  • orthodontist
  • orthogeneses
  • orthogenesis
  • orthogenetic
  • orthogonally
  • orthographic
  • orthopaedics
  • orthopedists
  • orthopterans
  • orthopterist
  • orthopteroid
  • orthorhombic
  • orthotropous
  • oscillations
  • oscillograms
  • oscillograph
  • oscilloscope
  • osmolalities
  • osmolarities
  • ossification
  • ostentations
  • ostentatious
  • osteoblastic
  • osteoclastic
  • osteogeneses
  • osteogenesis
  • osteological
  • osteologists
  • osteomalacia
  • osteopathies
  • osteoplastic
  • osteoporoses
  • osteoporosis
  • osteoporotic
  • osteosarcoma
  • ostracoderms
  • otherworldly
  • otiosenesses
  • otoscleroses
  • otosclerosis
  • outachieving
  • outbalancing
  • outbargained
  • outbrazening
  • outbreedings
  • outbuildings
  • outcavilling
  • outcompeting
  • outcroppings
  • outdatedness
  • outdelivered
  • outdesigning
  • outdistanced
  • outdistances
  • outgalloping
  • outgeneraled
  • outglittered
  • outgoingness
  • outintrigued
  • outintrigues
  • outjockeying
  • outlandishly
  • outmaneuvers
  • outmastering
  • outnumbering
  • outorganized
  • outorganizes
  • outperformed
  • outplacement
  • outpoliticks
  • outpopulated
  • outpopulates
  • outpreaching
  • outproducing
  • outpromising
  • outrageously
  • outreasoning
  • outrebounded
  • outreckoning
  • outreproduce
  • outrivalling
  • outscreaming
  • outsiderness
  • outsourcings
  • outsparkling
  • outspreading
  • outspringing
  • outsprinting
  • outstretched
  • outstretches
  • outstripping
  • outthrobbing
  • outthrusting
  • outtraveling
  • outtravelled
  • outwrestling
  • ovariotomies
  • overabstract
  • overabundant
  • overachieved
  • overachiever
  • overachieves
  • overactivity
  • overanalyses
  • overanalysis
  • overanalyzed
  • overanalyzes
  • overarousals
  • overarranged
  • overarranges
  • overasserted
  • overbalanced
  • overbalances
  • overbleached
  • overbleaches
  • overborrowed
  • overbreeding
  • overbriefing
  • overbrowsing
  • overbuilding
  • overburdened
  • overcapacity
  • overcastings
  • overcautions
  • overcautious
  • overcharging
  • overchilling
  • overclaiming
  • overclassify
  • overcleaning
  • overclearing
  • overclouding
  • overcoaching
  • overcoloring
  • overcompress
  • overconcerns
  • overconsumed
  • overconsumes
  • overcontrols
  • overcorrects
  • overcounting
  • overcramming
  • overcritical
  • overcropping
  • overcrowding
  • overdecorate
  • overdesigned
  • overdevelops
  • overdirected
  • overdiscount
  • overdocument
  • overdominant
  • overdramatic
  • overdressing
  • overdrinking
  • overeducated
  • overeducates
  • overemphases
  • overemphasis
  • overemphatic
  • overenamored
  • overengineer
  • overenrolled
  • overequipped
  • overestimate
  • overexciting
  • overexercise
  • overexerting
  • overexertion
  • overexpanded
  • overexplains
  • overexplicit
  • overexploits
  • overexposing
  • overexposure
  • overextended
  • overfamiliar
  • overfatigued
  • overfatigues
  • overfavoring
  • overflooding
  • overfocusing
  • overfocussed
  • overfocusses
  • overfulfills
  • overgarments
  • overgenerous
  • overgoverned
  • overhandling
  • overharvests
  • overhonoring
  • overhuntings
  • overidealize
  • overidentify
  • overindulged
  • overindulges
  • overinflated
  • overinflates
  • overinformed
  • overissuance
  • overlaboring
  • overlearning
  • overlengthen
  • overlighting
  • overliterary
  • overlordship
  • overmanaging
  • overmannered
  • overmastered
  • overmatching
  • overmaturity
  • overmedicate
  • overmodestly
  • overnighters
  • overnighting
  • overoperated
  • overoperates
  • overoptimism
  • overoptimist
  • overorganize
  • overornament
  • overpackaged
  • overpackages
  • overpayments
  • overpedaling
  • overpedalled
  • overpeopling
  • overpersuade
  • overplanning
  • overplanting
  • overplotting
  • overpopulate
  • overpowering
  • overpraising
  • overpressure
  • overprinting
  • overproduced
  • overproduces
  • overprograms
  • overpromised
  • overpromises
  • overpromoted
  • overpromotes
  • overprotects
  • overreachers
  • overreaching
  • overreacting
  • overreaction
  • overregulate
  • overreliance
  • overreported
  • overresponds
  • overroasting
  • oversanguine
  • oversaturate
  • overserviced
  • overservices
  • overshadowed
  • overshooting
  • oversimplify
  • overslaughed
  • oversleeping
  • overslipping
  • overspenders
  • overspending
  • overspilling
  • overstaffing
  • oversteering
  • overstepping
  • overstirring
  • overstocking
  • overstrained
  • overstressed
  • overstresses
  • overstrewing
  • overstridden
  • overstriding
  • overstudying
  • overstuffing
  • oversupplied
  • oversupplies
  • oversweetens
  • overswinging
  • overtaxation
  • overteaching
  • overthinking
  • overthrowing
  • overtightens
  • overtraining
  • overtreating
  • overtrimming
  • overtrumping
  • overutilized
  • overutilizes
  • overvoltages
  • overwatching
  • overwatering
  • overwearying
  • overweighing
  • overweighted
  • overwhelming
  • overwintered
  • overwithheld
  • overwithhold
  • ovipositions
  • owlishnesses
  • oxalacetates
  • oxaloacetate
  • oxyacetylene
  • oxygenations
  • ozonizations
  • ozonospheres
  • oafishnesses
  • oarsmanships
  • obcompressed
  • obdurateness
  • obedientiary
  • obfuscations
  • objectifying
  • objectivated
  • objectivates
  • objectivised
  • objectivises
  • objectivisms
  • objectivists
  • objectivized
  • objectivizes
  • objurgations
  • oblanceolate
  • oblatenesses
  • obligational
  • obligatorily
  • obligingness
  • obliquations
  • obliterating
  • obliteration
  • obliterative
  • obliterators
  • obliviscence
  • obmutescence
  • obnubilating
  • obnubilation
  • obreptitious
  • obscurantism
  • obscurantist
  • obscurations
  • obscurements
  • obsecrations
  • obsequiously
  • observancies
  • observations
  • obsessionist
  • obsignations
  • obsolescence
  • obsoleteness
  • obstetrician
  • obstipations
  • obstreperate
  • obstreperous
  • obstrictions
  • obstropalous
  • obstropulous
  • obstructions
  • obstructives
  • obtemperated
  • obtemperates
  • obtestations
  • obtruncating
  • obtusenesses
  • obumbrations
  • occasionally
  • occidentally
  • occultations
  • occultnesses
  • occupational
  • oceanography
  • oceanologies
  • oceanologist
  • ochlocracies
  • ochlophobiac
  • ochlophobias
  • ochroleucous
  • octahedrally
  • octahedrites
  • octapeptides
  • octaploidies
  • octastichons
  • octastichous
  • octastrophic
  • octillionths
  • octogenarian
  • octogenaries
  • octopetalous
  • octosepalous
  • octostichous
  • octosyllabic
  • octosyllable
  • octuplicates
  • odiousnesses
  • odontoblasts
  • odontogenies
  • odontographs
  • odontography
  • odontologies
  • odontologist
  • odontomatous
  • odontophobia
  • odontophoral
  • odontophoran
  • odontophores
  • odorimetries
  • oenophilists
  • oesophagitis
  • offendresses
  • officeholder
  • officialdoms
  • officialeses
  • officialisms
  • officialties
  • officiations
  • offishnesses
  • offscourings
  • oleaginously
  • oleandomycin
  • oleographies
  • oleomargarin
  • oleoresinous
  • olfactometer
  • olfactometry
  • olfactronics
  • oligarchical
  • oligochaetes
  • oligochromes
  • oligopeptide
  • oligophagies
  • oligophagous
  • oligopsonies
  • oligospermia
  • oligotrophic
  • ombrophilous
  • ombrophobous
  • omissiveness
  • ommatophores
  • omnificences
  • omniparities
  • omnipotences
  • omnipotently
  • omnipresence
  • omnisciences
  • omnisciently
  • omnivorously
  • omphalomancy
  • oncogenicity
  • oncornavirus
  • oneirocritic
  • oneirodynias
  • oneirologies
  • oneiromancer
  • onomasiology
  • onomastician
  • onomasticons
  • onomatopoeia
  • onomatopoeic
  • onychophoran
  • oophorectomy
  • oophoritises
  • opalescences
  • opalescently
  • opaquenesses
  • opeidoscopes
  • openhandedly
  • operatically
  • operationism
  • operationist
  • operatorless
  • ophicalcites
  • ophidiariums
  • ophiolatries
  • ophiolatrous
  • ophiological
  • ophiologists
  • ophiomorphic
  • ophiophagous
  • ophiophilist
  • ophthalmists
  • ophthalmitis
  • opinionately
  • opinionative
  • opinionators
  • opisthodomoi
  • opisthodomos
  • opisthograph
  • opisthotonic
  • opisthotonos
  • opotherapies
  • oppignerated
  • oppignerates
  • oppignorated
  • oppignorates
  • opportunisms
  • opportunists
  • opposability
  • oppositeness
  • oppositional
  • oppressingly
  • oppressively
  • oppugnancies
  • opsonisation
  • opsonization
  • optimalising
  • optimalities
  • optimalizing
  • optimisation
  • optimistical
  • optimization
  • optoacoustic
  • optometrical
  • optometrists
  • oracularness
  • oratorically
  • orbicularity
  • orchestrally
  • orchestrated
  • orchestrater
  • orchestrates
  • orchestrator
  • orchestrinas
  • orchestrions
  • orchidaceous
  • orchidectomy
  • orchidomania
  • ordinariness
  • oreographies
  • orepearching
  • organicistic
  • organicities
  • organisation
  • organismally
  • organistrums
  • organization
  • organogenies
  • organography
  • organoleptic
  • organologies
  • organologist
  • orichalceous
  • orientalised
  • orientalises
  • orientalisms
  • orientalists
  • orientalized
  • orientalizes
  • orientations
  • orienteering
  • originations
  • orismologies
  • ornamentally
  • ornamentists
  • ornatenesses
  • ornerinesses
  • ornithogalum
  • ornithologic
  • ornithomancy
  • ornithomorph
  • ornithophily
  • ornithopters
  • ornithosaurs
  • ornithoscopy
  • orogenically
  • orographical
  • orologically
  • oropharynges
  • oropharynxes
  • ororotundity
  • orotundities
  • orthoborates
  • orthocenters
  • orthocentres
  • orthocephaly
  • orthocousins
  • orthodontias
  • orthodontics
  • orthodontist
  • orthodromics
  • orthodromies
  • orthogeneses
  • orthogenesis
  • orthogenetic
  • orthognathic
  • orthogonally
  • orthographer
  • orthographic
  • orthomorphic
  • orthopaedics
  • orthopaedies
  • orthopaedist
  • orthopedical
  • orthopedists
  • orthopraxies
  • orthopterans
  • orthopterist
  • orthopteroid
  • orthopterous
  • orthorhombic
  • orthotoneses
  • orthotonesis
  • orthotropies
  • orthotropism
  • orthotropous
  • orthovanadic
  • oryctologies
  • oscillations
  • oscillograms
  • oscillograph
  • oscilloscope
  • osculatories
  • osmolalities
  • osmolarities
  • ossification
  • osteichthyan
  • ostentations
  • ostentatious
  • osteoblastic
  • osteoclastic
  • osteodermous
  • osteogeneses
  • osteogenesis
  • osteogenetic
  • osteological
  • osteologists
  • osteomalacia
  • osteomalacic
  • osteopathies
  • osteopathist
  • osteoplastic
  • osteoporoses
  • osteoporosis
  • osteoporotic
  • osteosarcoma
  • ostracisable
  • ostracizable
  • ostracoderms
  • ostreophages
  • otherworldly
  • otiosenesses
  • otoscleroses
  • otosclerosis
  • outachieving
  • outbalancing
  • outbargained
  • outblustered
  • outbrazening
  • outbreathing
  • outbreedings
  • outbuildings
  • outcavilling
  • outcompeting
  • outcraftying
  • outcroppings
  • outcrossings
  • outdatedness
  • outdelivered
  • outdesigning
  • outdistanced
  • outdistances
  • outercourses
  • outfangthief
  • outgalloping
  • outgeneraled
  • outglittered
  • outgoingness
  • outintrigued
  • outintrigues
  • outjockeying
  • outlandishly
  • outlaunching
  • outmaneuvers
  • outmanoeuvre
  • outmarriages
  • outmastering
  • outmeasuring
  • outmodedness
  • outnumbering
  • outorganised
  • outorganises
  • outorganized
  • outorganizes
  • outpassioned
  • outperformed
  • outplacement
  • outpoliticks
  • outpopulated
  • outpopulates
  • outpreaching
  • outproducing
  • outpromising
  • outrageously
  • outreasoning
  • outrebounded
  • outreckoning
  • outreddening
  • outreproduce
  • outrivalling
  • outscreaming
  • outsiderness
  • outsourcings
  • outsparkling
  • outspreading
  • outspringing
  • outsprinting
  • outstraining
  • outstretched
  • outstretches
  • outstripping
  • outsweetened
  • outthrobbing
  • outthrusting
  • outtraveling
  • outtravelled
  • outvillained
  • outwrestling
  • ovariotomies
  • ovariotomist
  • overabounded
  • overabstract
  • overabundant
  • overachieved
  • overachiever
  • overachieves
  • overactivity
  • overanalysed
  • overanalyses
  • overanalysis
  • overanalyzed
  • overanalyzes
  • overarousals
  • overarranged
  • overarranges
  • overasserted
  • overbalanced
  • overbalances
  • overbiddings
  • overblankets
  • overbleached
  • overbleaches
  • overborrowed
  • overbounding
  • overbreeding
  • overbridging
  • overbriefing
  • overbrimming
  • overbrowsing
  • overbuilding
  • overburdened
  • overburthens
  • overcanopied
  • overcanopies
  • overcapacity
  • overcarrying
  • overcastings
  • overcatching
  • overcautions
  • overcautious
  • overcharging
  • overchilling
  • overclaiming
  • overclassify
  • overcleaning
  • overclearing
  • overclouding
  • overcoaching
  • overcoatings
  • overcoloring
  • overcoloured
  • overcompress
  • overconcerns
  • overconsumed
  • overconsumes
  • overcontrols
  • overcorrects
  • overcounting
  • overcovering
  • overcramming
  • overcritical
  • overcropping
  • overcrowding
  • overdecorate
  • overdesigned
  • overdevelops
  • overdeviated
  • overdeviates
  • overdirected
  • overdiscount
  • overdocument
  • overdominant
  • overdramatic
  • overdraughts
  • overdressing
  • overdrinking
  • overeducated
  • overeducates
  • overemphases
  • overemphasis
  • overemphatic
  • overenamored
  • overengineer
  • overenrolled
  • overequipped
  • overestimate
  • overexciting
  • overexercise
  • overexerting
  • overexertion
  • overexpanded
  • overexplains
  • overexplicit
  • overexploits
  • overexposing
  • overexposure
  • overextended
  • overfamiliar
  • overfatigued
  • overfatigues
  • overfavoring
  • overfineness
  • overfinished
  • overflooding
  • overflourish
  • overflowings
  • overfocusing
  • overfocussed
  • overfocusses
  • overfondness
  • overfreedoms
  • overfreights
  • overfulfills
  • overfullness
  • overfundings
  • overgarments
  • overgenerous
  • overglancing
  • overglooming
  • overgoverned
  • overgrainers
  • overgraining
  • overgrassing
  • overgrazings
  • overgreening
  • overhandling
  • overharvests
  • overheatings
  • overhonoring
  • overhuntings
  • overidealise
  • overidealize
  • overidentify
  • overinclined
  • overindulged
  • overindulges
  • overinflated
  • overinflates
  • overinformed
  • overinsuring
  • overissuance
  • overkindness
  • overlaboring
  • overlaboured
  • overlaunched
  • overlaunches
  • overlearning
  • overleathers
  • overleavened
  • overlengthen
  • overlighting
  • overliterary
  • overlockings
  • overlordship
  • overmanaging
  • overmannered
  • overmastered
  • overmatching
  • overmaturity
  • overmeasured
  • overmeasures
  • overmedicate
  • overmodestly
  • overmounting
  • overmultiply
  • overniceness
  • overnighters
  • overnighting
  • overofficing
  • overoperated
  • overoperates
  • overoptimism
  • overoptimist
  • overorganise
  • overorganize
  • overornament
  • overpackaged
  • overpackages
  • overpainting
  • overpayments
  • overpedaling
  • overpedalled
  • overpeopling
  • overperching
  • overpersuade
  • overpictured
  • overpictures
  • overpitching
  • overplanning
  • overplanting
  • overplotting
  • overpopulate
  • overpowering
  • overpraising
  • overprepared
  • overprepares
  • overpressing
  • overpressure
  • overprinting
  • overproduced
  • overproduces
  • overprograms
  • overpromised
  • overpromises
  • overpromoted
  • overpromotes
  • overprotects
  • overrashness
  • overreachers
  • overreaching
  • overreacting
  • overreaction
  • overreckoned
  • overrefining
  • overregulate
  • overreliance
  • overreported
  • overresponds
  • overripeness
  • overripening
  • overroasting
  • oversanguine
  • oversaturate
  • overschutcht
  • overscutched
  • overserviced
  • overservices
  • overshadowed
  • overshooting
  • overshowered
  • oversimplify
  • overskipping
  • overslaughed
  • oversleeping
  • overslipping
  • overspenders
  • overspending
  • overspilling
  • overstaffing
  • overstaining
  • overstanding
  • oversteering
  • overstepping
  • overstinking
  • overstirring
  • overstocking
  • overstrained
  • overstressed
  • overstresses
  • overstrewing
  • overstridden
  • overstriding
  • overstriking
  • overstudying
  • overstuffing
  • oversubtlety
  • oversupplied
  • oversupplies
  • overswearing
  • oversweetens
  • overswelling
  • overswimming
  • overswinging
  • overtaxation
  • overteaching
  • overthinking
  • overthrowers
  • overthrowing
  • overthwarted
  • overtightens
  • overtowering
  • overtraining
  • overtreating
  • overtrimming
  • overtripping
  • overtrumping
  • overtrusting
  • overutilised
  • overutilises
  • overutilized
  • overutilizes
  • overvoltages
  • overwatching
  • overwatering
  • overwearying
  • overweathers
  • overweenings
  • overweighing
  • overweighted
  • overwhelming
  • overwintered
  • overwithheld
  • overwithhold
  • overwresting
  • overwrestled
  • overwrestles
  • ovipositions
  • owlishnesses
  • oxalacetates
  • oxaloacetate
  • oxidimetries
  • oxidisations
  • oxidizations
  • oxyacetylene
  • oxycephalies
  • oxycephalous
  • oxygenations
  • oxysulphides
  • ozonisations
  • ozonizations
  • ozonospheres