Uncountable Nouns That Start with OPI

Find 10 valid English uncountable nouns starting with OPI, including Opinion, Opium, Opinionativeness, Opinionatedness, Opisthotonos, Opisthotonus and Opiumism. Check definitions and usage below, or visit our noun grammar guide to check quantifier and measurement rules.

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Starts with OPIN
3 words
opinion
opinionativeness
opinionatedness
Starts with OPIS
5 words
opisthotonos
opisthotonus
opisthography
opisthognathism
opisthognathidae
Starts with OPIU
2 words
opium
opiumism

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