Compound Nouns That Start with O and End with US

Explore 5 verified English compound nouns starting with O and ending with US, including Organophosphorus, Oncovirus, Overplus, Orthomyxovirus and Oncornavirus. Sort these combined words and multi-part naming terms by word length for spelling practice, word puzzles, and vocabulary expansion below, or check closed, hyphenated, and open compound rules in our noun grammar guide.

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Starts with ON
2 words
oncovirus
oncornavirus
Starts with OR
2 words
organophosphorus
orthomyxovirus
Starts with OV
1 words
overplus

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