Uncountable Nouns Starting with O and Containing A

Browse 739 valid English uncountable nouns starting with O and containing A, from Organization, Operation, Operating, Ordinary, Occasion, Orange and Observation to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to check quantifier and measurement rules.

Refine list...
JUMP:
Sort:
Group:
Case:
View:
JUMP TO:
Select any word to view available definitions & photosSelect any word for details
Starts with OA10 words
oatmeal
oakwood
oakum
oakleaf
oafishness
oarsmanship
oakmoss
oarage
oakiness
oarweed
Starts with OB24 words
observation
obligation
observance
obsidian
objectification
obliteration
obfuscation
obstinacy
observability
obeisance
oblation
obscuration
obduracy
obtainment
obscurantism
obviation
obligatoriness
obstinateness
obtainability
obeah
objectionability
oblateness
objectionableness
obstipation
Starts with OC24 words
occasion
occupation
occupancy
octane
oceanside
oceanography
octal
occam
occultation
oca
ochlocracy
occidentalism
occasionalism
octanol
occidentalization
octopamine
occupance
oceanology
octahedrite
octameter
ochlophobia
occasionality
occamy
octaplas
Starts with OD9 words
odessa
odawa
odal
odonata
odontalgia
odonatology
odontophobia
odontography
odontohyperesthesia
Starts with OE
2 words
oenomania
oenomancy
Starts with OF10 words
offstage
offal
officialdom
offtake
officiality
officiation
officialese
offhandedness
officialism
officialty
Starts with OG
2 words
ogham
oganesson
Starts with OH
2 words
ohia
ohmage
Starts with OI
2 words
oilpaper
oiticica
Starts with OK3 words
okra
oka
okara
Starts with OL24 words
oligarchy
olfaction
oligosaccharide
oligomerization
oldspeak
olestra
oleomargarine
oliguria
oligodendroglia
olibanum
oleate
oligospermia
oleography
oligoclase
oligemia
oleothorax
olfactology
olfactometry
oleandomycin
oligophagy
olfactronics
oleaginousness
oligocythemia
olecranarthritis
Starts with OM24 words
oman
omani
omeprazole
omakase
omerta
omnishambles
omnisexuality
omphaloskepsis
omija
omittance
omophagy
omphalitis
omophagia
omphacite
omniana
omnivora
omphalophlebitis
omnifariousness
ombudsmanship
omlah
omniparity
omrah
omnisignificance
omnipotentiality
Starts with ON16 words
onboarding
onomatopoeia
onomastics
onanism
onomatopoiesis
oneiromancy
onycha
onchocerciasis
onychia
onomatology
onfall
onychophagy
onglaze
onomasiology
oneirodynia
onychomancy
Starts with OO3 words
oompah
oom-pah-pah
oogamy
Starts with OP24 words
operation
operating
opera
optimization
opaque
opacity
opal
ophthalmology
operetta
optimality
operability
optionality
opaqueness
opalescence
optative
operatics
opaline
openheartedness
operatorship
opsonization
ophidiophobia
ophthalmia
ophthalmoscopy
operagoing
Starts with OR24 words
organization
ordinary
orange
orientation
originality
orgasm
ornament
orchestration
orphanage
ordination
oregano
origami
ornamentation
oratory
ordnance
origination
oration
orthography
ordinariness
orthogonality
orientalism
originalism
orangeade
organza
Starts with OS24 words
osaka
oscillation
osteoarthritis
ostracism
ostentation
osteopathy
ossification
osmolarity
osteosarcoma
osteopenia
osmolality
osmanthus
oseltamivir
osetra
osmoregulation
osteomalacia
ostentatiousness
osculation
osteoarthrosis
ostrava
ossetra
osmophobia
osteoplasty
osteoarthropathy
Starts with OT6 words
ottoman
otolaryngology
otoplasty
otorrhea
otalgia
otohemineurasthenia
Starts with OU24 words
outrage
outreach
outward
outage
outerwear
outback
outlay
outperformance
outrageousness
outspread
outland
outplacement
outlandishness
outdatedness
outlawry
outstate
outgassing
outmigration
outpainting
outwardness
outdoorsmanship
outwash
ouabain
outrance
Starts with OV24 words
overhead
overlap
overload
overlay
overhang
overcast
ovulation
overreaction
overpayment
overdraft
overpay
overpopulation
overreach
overstatement
overeating
overwatch
overabundance
overhand
oversimplification
overplay
overreliance
oversharing
overemphasis
overstimulation
Starts with OW
1 words
oware
Starts with OX22 words
oxidation
oxygenation
oxtail
oxidase
oxalate
oxidization
oxazepam
oxalis
oxaloacetate
oxyacetylene
oxacillin
oxytetracycline
oxygenase
oxgall
oxyacid
oxazole
oxazine
oxazolone
oxyuriasis
oxycephaly
oxyanthraquinone
oxyphenbutazone
Starts with OZ3 words
ozonation
ozonization
ozena

•Browse Uncountable Nouns by Letter (A to Z)

Select a starting letter to browse uncountable 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.