Countable Nouns Starting with OCT and Containing ON

This list gathers 11 English countable nouns starting with OCT and containing ON, such as Octagon, Octahedron, Octillion, Octoroon, Octonary, Octodecillion and Octillionth. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.

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Starts with OCTA4 words
octagon
octahedron
octakishexahedron
octastichon
Starts with OCTI
2 words
octillion
octillionth
Starts with OCTO5 words
octoroon
octonary
octodecillion
octonarius
octonarian

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