Words Starting with O and Containing OS

Browse 378 verified English words starting with O and containing OS, including Opposition, Oppose, Opposed, Opposing, Overdose, Outpost and Osteoporosis. Validated against official game lexicons for Scrabble, Wordle, crosswords, and daily writing, explore definitions and letter counts below.

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Starts with OA
1 words
oakmoss
Starts with OB
1 words
obdiplostemonous
Starts with OC9 words
octosyllabic
octosyllable
occipitoposterior
octostyle
octosepalous
octostichous
occipitosphenoidal
occipitosphenoid
occipitoscapular
Starts with OD
2 words
odontoglossum
odontostomatous
Starts with OL4 words
oligosaccharide
oloroso
oligospermia
oligophosphaturia
Starts with OM4 words
omphalos
omphaloskepsis
omentosplenopexy
omoplatoscopy
Starts with ON6 words
oncost
onychocryptosis
onos
oneiroscopy
oncostman
oneiroscopist
Starts with OO7 words
oosphere
oospore
oophorosalpingectomy
oose
oosperm
oosporous
oosporic
Starts with OP24 words
opposite
opposition
oppose
opposed
opposing
opossum
oppositional
opposable
opposer
oppositely
ophthalmoscope
oppositionist
ophthalmoscopy
ophthalmoscopic
oppositeness
opposably
opisthosoma
oppositionless
opisthotonos
opposability
opposingly
operose
oppositionism
oppositive
Starts with OR24 words
orthostatic
ordos
organophosphate
organophosphorus
orthophosphate
orthosis
ornithosis
orthosilicic
orthros
ornithomimosaur
orthoscopic
orthosilicate
orthoscope
orthophosphoric
orthostat
orthosymmetrical
organosol
orthosubstituted
orthostichy
ornithoscopy
orbitosphenoid
orthostichous
ornithosaur
orthrosanthus
Starts with OS24 words
oscar
oscars
osaka
oslo
osteoporosis
ostensibly
ostrich
osmosis
oscillate
oscillation
ostentatious
osteoarthritis
ostensible
ostracize
oscillator
osprey
ostracism
os
ostentation
ostomy
oscilloscope
osmotic
osteopathic
osteopathy
Starts with OT11 words
otoscope
otiose
otosclerosis
otoscopy
otoscopically
otosclerotic
otoscopic
otiosity
otiosely
otioseness
otosalpinx
Starts with OU7 words
outpost
outermost
outmost
ouroboros
outgross
outcross
outcrossing
Starts with OV22 words
overdose
overexposed
overexposure
overexpose
overdiagnosis
oviposition
overdiagnose
overdosage
overgenerosity
ovipositor
oviposit
ovipositional
overphilosophize
overpost
ovibos
overclose
overcuriosity
overscrupulosity
overprosperousness
ovariosalpingectomy
overpositiveness
overprosperously
Starts with OX
1 words
oxararfoss
Starts with OZ
1 words
ozonosphere

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Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.