VIII vs octet

VIII and octet both are nouns.

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

As nouns, VIII and octet are synonyms defined as:

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

VIII (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