Uncountable Nouns That Start with O and End with S
Explore 358 verified English uncountable nouns starting with O and ending with S, including Odds, Outdoors, Openness, Optics, Octopus, Orthopedics and Osteoporosis. Sort these mass nouns and non-count terms for substances and concepts by word length for quantifier accuracy, academic writing, and ESL study below, or check quantifier and measurement rules in our noun grammar guide.
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Starts with OA3 words
oafishness
oakmoss
oakiness
Starts with OB24 words
obstetrics
obviousness
obliviousness
obsessiveness
obscureness
obtuseness
obnoxiousness
obligingness
objectiveness
obsequiousness
obliqueness
obligatoriness
obstinateness
obsoleteness
obtrusiveness
obeseness
obsceneness
obstructiveness
oblateness
objectionableness
observableness
obstreperousness
obdurateness
objectlessness
Starts with OC4 words
octopus
occultness
octaplas
occlusiveness
Starts with OD5 words
odds
oddness
odiousness
odorousness
odoriferousness
Starts with OF5 words
offensiveness
officiousness
offhandedness
offishness
oftenness
Starts with OI
1 words oiliness
Starts with OL6 words
olympus
oldness
olfactronics
oleaginousness
oliguresis
olecranarthritis
Starts with OM9 words
omnishambles
ominousness
omphaloskepsis
omnivorousness
omphalitis
omphalophlebitis
omnifariousness
omissiveness
omnirepresentativeness
Starts with ON12 words
oneness
onomastics
ongoingness
oncogenesis
ontogenesis
onomatopoiesis
onerousness
oncolysis
onchocerciasis
onychocryptosis
oneirocritics
onychitis
Starts with OO4 words
oogenesis
ooziness
oophoritis
oofiness
Starts with OP24 words
openness
optics
openmindedness
opaqueness
optoelectronics
optogenetics
oppressiveness
operatics
openendedness
openheartedness
optronics
oppositeness
opportuneness
opinionativeness
openhandedness
operativeness
opinionatedness
opisthotonos
opprobriousness
opisthotonus
ophthalmitis
openmouthedness
operoseness
ophthalmomycosis
Starts with OR24 words
orthopedics
orthotics
ordinariness
orderliness
orthodontics
orneriness
ordos
ornateness
organogenesis
orris
orchitis
organophosphorus
orchardgrass
orthoptics
orogenesis
orthopraxis
orthogenesis
organometallics
ornithosis
orthros
orexis
orchestics
oracularness
orchesis
Starts with OS20 words
osteoporosis
osmosis
osteoarthritis
osteonecrosis
osteomyelitis
osteogenesis
osmanthus
osteolysis
ostentatiousness
osteoarthrosis
osteopetrosis
osteitis
osmidrosis
osteofibrosis
osteoclasis
osmics
ostosis
osteosis
osteoperiostitis
osteohalisteresis
Starts with OT5 words
otherness
otitis
otherworldliness
otosclerosis
otioseness
Starts with OU14 words
outdoors
outrageousness
outspokenness
outness
outlandishness
outsiderness
outdatedness
outgoingness
outwardness
outcross
oughtness
outmodedness
outrightness
oughtlins
Starts with OV24 words
overemphasis
overdiagnosis
overanalysis
overstress
overwhelmingness
overplus
overtness
overzealousness
overeagerness
overdramatics
overfocus
ovalness
overaggressiveness
overcompetitiveness
overpermissiveness
oversensitiveness
overcautiousness
overdefensiveness
overripeness
ovaritis
overambitiousness
overassertiveness
overbearingness
overfondness
Starts with OW
1 words owlishness
Starts with OX3 words
oxus
oxalis
oxyuriasis
Starts with OZ
1 words ozonolysis