Nouns Starting with OP and Containing UM

Browse 11 valid English nouns starting with OP and containing UM, from Optimum, Opium, Opossum, Opprobrium, Operculum, Oppidum and Opusculum to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review pluralization and capitalization rules.

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Starts with OPE
1 words
operculum
Starts with OPH
2 words
ophidiarium
ophthalmophyllum
Starts with OPI
2 words
opium
opiumism
Starts with OPO
1 words
opossum
Starts with OPP
2 words
opprobrium
oppidum
Starts with OPS
1 words
opsonium
Starts with OPT
1 words
optimum
Starts with OPU
1 words
opusculum

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