Countable Nouns That Start with BO and End with UM

Explore 6 verified English countable nouns starting with BO and ending with UM, including Botulinum, Boojum, Bonum, Botrychium, Bothrium and Botrydium. 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 BON
1 words
bonum
Starts with BOO
1 words
boojum
Starts with BOT4 words
botulinum
botrychium
bothrium
botrydium

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