Countable Nouns Ending in NUM and Containing O

Browse 15 valid English countable nouns ending in NUM and containing O, from Duodenum, Solanum, Botulinum, Organum, Bonum, Origanum and Polygonum 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 B
2 words
botulinum
bonum
Starts with C
1 words
chrysogonum
Starts with D
1 words
duodenum
Starts with E
3 words
eriogonum
entosternum
endosternum
Starts with O
2 words
organum
origanum
Starts with P
2 words
polygonum
prosternum
Starts with S
2 words
solanum
schizotrypanum
Starts with V
1 words
verumontanum
Starts with X
1 words
xiphosternum

•Browse Countable Nouns by Letter (A to Z)

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