Countable Nouns Starting with O and Containing AC

This list gathers 55 English countable nouns starting with O and containing AC, such as Obstacle, Outreach, Oracle, Opacity, Outback, Overreaction and Olfactory. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.

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Starts with OB
2 words
obstacle
obstinacy
Starts with OC3 words
ochlocracy
octachord
ochlophobiac
Starts with OL7 words
olfactory
oligosaccharide
olfact
olfactologist
olfactometer
olfactophobia
oleorefractometer
Starts with OM
1 words
omphacite
Starts with OP4 words
opacity
opacifier
opacification
opsomaniac
Starts with OR6 words
oracle
orach
orache
oracularity
orchidomaniac
orthopinacoid
Starts with OS8 words
ostracism
ostracod
ostracon
ostracizer
ostracoderm
ostracodan
ostracean
oshac
Starts with OU4 words
outreach
outback
outbacker
outplacer
Starts with OV17 words
overreaction
overreach
overachiever
overpack
overactivity
overachievement
overcapacity
overreacher
overaction
overaccumulation
overextraction
overabstraction
overacceleration
ovisac
overdelicacy
overbleach
overaccentuation
Starts with OX3 words
oxaloacetate
oxytetracycline
oxyacid

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