Countable Nouns Starting with OP and Containing EN

Explore 11 verified English countable nouns starting with OP and containing EN, including Open, Opening, Opponent, Opener, Opencast, Openwork and Openside. 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 OPE6 words
open
opening
opener
opencast
openwork
openside
Starts with OPH
1 words
ophthalmencephalon
Starts with OPP3 words
opponent
opponency
opponens
Starts with OPT
1 words
optomeninx

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