Countable Nouns Starting with O and Containing OM

This list gathers 147 English countable nouns starting with O and containing OM, such as Outcome, Omission, Omen, Omega, Ombudsman, Omicron and Omelet. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.

Refine list...
JUMP:
Sort:
Group:
Case:
View:
JUMP TO:
Select any word to view available definitions & photosSelect any word for details
Starts with OA
1 words
oarswoman
Starts with OC
1 words
oculomotor
Starts with OD
1 words
odontoma
Starts with OE3 words
oedometer
oenomel
oenometer
Starts with OL9 words
oligomer
oligomerization
oleomargarine
oligodendroglioma
oleandomycin
olfactometer
oligochrome
oleorefractometer
oligochronometer
Starts with OM24 words
omission
omen
omega
ombudsman
om
omicron
omelet
omnibus
omnipotent
omnivore
omniscient
omani
ombre
omeprazole
ombudsperson
omakase
oma
omnium
omentum
ombuds
omer
omnisexual
omnishambles
omphalos
Starts with ON12 words
oncoming
onomatopoeia
onomatopoiesis
oncomouse
oneiromancer
onomasticon
oncome
onomatologist
onomastician
onomast
oncometer
oncotomy
Starts with OO8 words
oompah
oom
oom-pah-pah
oophorectomy
oophorosalpingectomy
oomycete
oophorhysterectomy
oophorocystectomy
Starts with OP21 words
optometrist
opisthosoma
optometer
ophthalmometer
ophthalmometry
opisometer
opisthodomos
ophthalmomycosis
ophthalmodynamometer
ophthalmostatometer
ophthalmothermometer
ophthalmomyositis
opsiometer
ophiomorph
ophthalmocarcinoma
ophthalmotonometer
ophthalmotropometer
opsomaniac
ophthalmomyotomy
ophthalmophlebotomy
optomeninx
Starts with OR13 words
orchiectomy
ornithomimid
organometallic
orchidectomy
organometallics
orthomyxovirus
organomercurial
ornithomimosaur
orthodromy
orchidomaniac
ornithomorph
orometer
orchiencephaloma
Starts with OS13 words
ostomy
osteosarcoma
osteomyelitis
osteotomy
ostomate
osteoma
osmometer
osteotome
osteochondrosarcoma
osteoenchondroma
osteochondrofibroma
osteoencephaloma
ostreodynamometer
Starts with OT
1 words
ottoman
Starts with OU
2 words
outcome
outdoorswoman
Starts with OV11 words
overcompensation
overcomer
overcommitment
overcomplication
ovariectomy
ovariohysterectomy
overcommercialization
ovariotomy
ovariotomist
overcommendation
ovariosalpingectomy
Starts with OX
1 words
oxysome

•Browse Countable Nouns by Letter (A to Z)

Select a starting letter to browse countable nouns
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWordsVocabulary HubPositive WordsNegative Words
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
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.