Countable Nouns Starting with OP and Containing OS

Explore 18 verified English countable nouns starting with OP and containing OS, including Opposition, Opossum, Opposer, Ophthalmoscope, Oppositionist, Ophthalmoscopy and Opisthosoma. 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 OPE
2 words
operosity
opeidoscope
Starts with OPH8 words
ophthalmoscope
ophthalmoscopy
ophthalmoscopist
ophthalmomycosis
ophthalmostatometer
ophthalmodiagnosis
ophthalmomyositis
ophthalmoleucoscope
Starts with OPI3 words
opisthosoma
opisthotonos
opisthodomos
Starts with OPO
1 words
opossum
Starts with OPP4 words
opposite
opposition
opposer
oppositionist

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