4
octave
3
seventh(noun, adjective, five)
2
one-eighth
1
fifth(noun, adjective, five)
1
thousandth(noun, adjective)
1
twelfth(noun, adjective, five)
1
contraoctave
1
double contraoctave
1
octuple
1
four-line octave
1
great octave
1
octadic
1
octagonal
1
octahedral
1
octal
1
octan
1
octaploid
1
octastyle
1
octofid
1
octonary
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APASmart Define. (2015). eighth thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/eighth/thesaurus/synonyms
ChicagoSmart Define. 2015. "eighth thesaurus" https://smartdefine.org/eighth/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, eighth thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/eighth/thesaurus/synonyms>.
MLASmart Define. "eighth thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/eighth/thesaurus/synonyms>