Countable Nouns Starting with OP and Containing NI

Browse 14 valid English countable nouns starting with OP and containing NI, from Opportunity, Opinion, Opening, Opportunist, Oppositionist, Opsonization and Opinionator to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review singular and plural count rules.

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Starts with OPE
2 words
opening
operationist
Starts with OPI4 words
opinion
opinionator
opinionist
opinicus
Starts with OPP3 words
opportunity
opportunist
oppositionist
Starts with OPS4 words
opsonization
opsonification
opsonium
opsomaniac
Starts with OPT
1 words
optomeninx

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