eight vs octet

eight and octet both are nouns.

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

As nouns, eight and octet are synonyms defined as:

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

eight (noun)	octet (noun)
one of four playing cards in a deck with eight pips on the face	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

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