Countable Nouns That Start with OCT

Explore 56 verified English countable nouns starting with OCT, including Octopus, Octave, Octagon, Octane, Octet, Octogenarian and Octavo. Browse these count nouns with singular and plural forms by length below, or review singular and plural count rules in our noun grammar guide.

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Starts with OCTA
21 words
octave
octagon
octane
octavo
octahedron
octant
octanol
octahedrite
octapeptide
octad
octameter
octangle
octarchy
octastyle
octastich
octachord
octapla
octapody
octakishexahedron
octastichon
octandrian
Starts with OCTE
2 words
octet
octennial
Starts with OCTI
4 words
octillion
octillionth
octingentenary
octingenary
Starts with OCTO
22 words
octopus
octogenarian
octothorp
octocopter
octothorpe
octoroon
octopod
octosyllabic
octopoid
octoploid
octonary
octosyllable
octodecimo
octofoil
octopodan
octodecillion
octostyle
octogenary
octocentenary
octonarius
octopusher
octonarian
Starts with OCTR
1 words
octroi
Starts with OCTU
5 words
octuple
octuplet
octuplex
octuplicate
octuor
Starts with OCTY
1 words
octyl

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