sextet vs VI

sextet and VI both are nouns.

Word	Noun	Adjective	Verb	Adverb
sextet	Yes	No	No	No
VI	Yes	No	No	No

As nouns, sextet and VI are synonyms defined as:

Other synonyms of sextet include 6, Captain Hicks, half a dozen, hexad, sestet, sextuplet, sise, six, sixer.

sextet (noun)	VI (noun)
a musical composition written for six performers	more than 130 southeastern Virgin Islands; a dependent territory of the United States
six people considered as a unit	the cardinal number that is the sum of five and one
a set of six similar things considered as a unit
six performers or singers who perform together
the cardinal number that is the sum of five and one