10 Letter Countable Nouns Starting with OP

Explore 16 verified English 10 letter countable nouns that start with OP, including Opposition, Oppression, Opinionist, Oppugnancy, Operettist, Ophicleide and Ophiopogon. 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
1 words
operettist
Starts with OPH4 words
ophicleide
ophiopogon
ophiolater
ophiomorph
Starts with OPI
2 words
opinionist
opisometer
Starts with OPP5 words
opposition
oppression
oppugnancy
oppilation
oppilative
Starts with OPS
2 words
opsiometer
opsomaniac
Starts with OPT
2 words
optologist
optomeninx

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