sextet vs six

sextet and six both are nouns.

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

As nouns, sextet and six are synonyms defined as:

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

sextet (noun)	six (noun)
a musical composition written for six performers	a playing card or domino or die whose upward face shows six pips
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

sextet (adjective)	six (adjective)
	denoting a quantity consisting of six items or units