Countable Nouns That Start with OM and End with UM

Explore 5 verified English countable nouns starting with OM and ending with UM, including Omnium, Omentum, Omasum, Ommatidium and Ommateum. 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 OMA
1 words
omasum
Starts with OME
1 words
omentum
Starts with OMM
2 words
ommatidium
ommateum
Starts with OMN
1 words
omnium

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