Countable Nouns That Start with OR and End with US

Explore 4 verified English countable nouns starting with OR and ending with US, including Organophosphorus, Ornithorhynchus, Orthomyxovirus and Orthrosanthus. 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 ORG
1 words
organophosphorus
Starts with ORN
1 words
ornithorhynchus
Starts with ORT
2 words
orthomyxovirus
orthrosanthus

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