Countable Nouns That Start with OP and End with X

Explore 5 verified English countable nouns starting with OP and ending with X, including Opoponax, Opifex, Opopanax, Operatrix and Optomeninx. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.

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Starts with OPE
1 words
operatrix
Starts with OPI
1 words
opifex
Starts with OPO
2 words
opoponax
opopanax
Starts with OPT
1 words
optomeninx

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