Countable Nouns Starting with OP and Containing ST

This list gathers 27 English countable nouns starting with OP and containing ST, such as Optimist, Opportunist, Optometrist, Ophthalmologist, Opencast, Oppositionist and Operationalist. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.

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Starts with OPE
4 words
opencast
operationalist
operationist
operettist
Starts with OPH
7 words
ophthalmologist
ophthalmist
ophiologist
ophiophilist
ophthalmoscopist
ophthalmostatometer
ophthalmodiastimeter
Starts with OPI
10 words
opinionist
opisthosoma
opisthotonos
opisthobranch
opisthograph
opisthography
opisthodomos
opisthopulmonate
opisthobranchiate
opisthocoelian
Starts with OPP
2 words
opportunist
oppositionist
Starts with OPT
4 words
optimist
optometrist
opticist
optologist

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