Countable Nouns Starting with OP and Containing S

Explore 64 verified English countable nouns starting with OP and containing S, including Opposition, Oppression, Optics, Optimist, Oppressor, Opus and Opportunist. Browse these count nouns with singular and plural forms below, or review singular and plural count rules in our noun grammar guide.

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Starts with OPE8 words
opencast
openside
operatorship
operationalist
operationist
operettist
operosity
opeidoscope
Starts with OPH17 words
ophthalmologist
ophthalmoscope
ophthalmoscopy
ophrys
ophthalmist
ophiologist
ophites
ophiophilist
ophthalmoscopist
ophthalmomycosis
ophthalmostatometer
ophthalmodiagnosis
ophthalmomyositis
ophthalmoneuritis
ophthalmodiastimeter
ophthalmorrhexis
ophthalmoleucoscope
Starts with OPI12 words
opinionist
opisthosoma
opisthotonos
opinicus
opisthobranch
opisthograph
opisometer
opisthography
opisthodomos
opisthopulmonate
opisthobranchiate
opisthocoelian
Starts with OPO
2 words
opossum
opobalsam
Starts with OPP8 words
opposite
opposition
oppression
oppressor
opportunist
opposer
oppositionist
opponens
Starts with OPS7 words
opsin
opsonization
opsimath
opsonification
opsiometer
opsonium
opsomaniac
Starts with OPT6 words
optics
optimist
optometrist
optimates
opticist
optologist
Starts with OPU4 words
opus
opuscule
opusculum
opulus

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