Nouns That Start with O and End with US

Explore 27 verified English nouns starting with O and ending with US, including Octopus, Opus, Omnibus, Onus, Oculus, Osmanthus and Organophosphorus. Sort these naming words for people, places, and things by word length for grammar study, classroom worksheets, and word games below, or review pluralization and capitalization rules in our noun grammar guide.

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Starts with OB
2 words
obelus
obliquus
Starts with OC4 words
octopus
oculus
ocellus
octonarius
Starts with OL
1 words
olympus
Starts with OM
1 words
omnibus
Starts with ON4 words
onus
oncovirus
oncornavirus
oncus
Starts with OP4 words
opus
opisthotonus
opinicus
opulus
Starts with OR4 words
organophosphorus
ornithorhynchus
orthomyxovirus
orthrosanthus
Starts with OS
1 words
osmanthus
Starts with OT
1 words
otocinclus
Starts with OV
2 words
overplus
overfocus
Starts with OX
2 words
oxus
oxyrhynchus
Starts with OZ
1 words
ozothamnus

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