- octad9
- octadic14
- octads10
- octagon13
- octagonal16
- octagonally21
- octagons14
- octahedra15
- octahedral17
- octahedrally22
- octahedron17
- octahedrons18
- octal9
- octameter15
- octameters16
- octan9
- octane10
- octanes11
- octangle15
- octangles16
- octanol12
- octanols13
- octans10
- octant10
- octantal13
- octants11
- octapeptide21
- octapeptides22
- octarchies18
- octarchy18
- octaval15
- octave13
- octaves14
- octavo13
- octavos14
- octet8
- octets9
- octette10
- octettes11
- octillion15
- octillions16
- octodecillion23
- octodecillions24
- octogenarian19
- octogenarians20
- octonaries14
- octonary14
- octopi12
- octoploid17
- octoploids18
- octopod14
- octopodes16
- octopods15
- octopus14
- octopuses16
- octoroon12
- octoroons13
- octosyllabic25
- octosyllabics26
- octosyllable23
- octosyllables24
- octothorp17
- octothorps18
- octroi9
- octrois10
- octuple15
- octupled17
- octuples16
- octuplet16
- octuplets17
- octuplex23
- octupling20
- octuply17
- octyl11
- octyls12