octet vs 8

octet and 8 both are nouns.

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

As nouns, octet and 8 are synonyms defined as:

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

octet (noun)	8 (noun)
a musical composition written for eight performers	the cardinal number that is the sum of seven and one
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

octet (adjective)	8 (adjective)
	being one more than seven