Countable Nouns Starting with OP and Containing SI

Explore 12 verified English countable nouns starting with OP and containing SI, including Opposition, Oppression, Opsin, Oppositionist, Openside, Opsimath and Operosity. 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
openside
operosity
Starts with OPH
3 words
ophthalmomycosis
ophthalmodiagnosis
ophthalmomyositis
Starts with OPP
4 words
opposite
opposition
oppression
oppositionist
Starts with OPS
3 words
opsin
opsimath
opsiometer

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