octonary vs octet

octonary and octet both are nouns.

Word	Noun	Adjective	Verb	Adverb
octonary	Yes	No	No	No
octet	Yes	No	No	No

As nouns, octonary and octet are synonyms defined as:

octonary and octet: the cardinal number that is the sum of seven and one

Other synonyms of octonary include 8, eight, eighter, eighter from Decatur, octad, ogdoad, VIII.

octonary (noun)	octet (noun)
the cardinal number that is the sum of seven and one	a musical composition written for eight performers
	eight people considered as a unit
	a set of eight similar things considered as a unit
	eight performers or singers who perform together
	the cardinal number that is the sum of seven and one