sextet vs assemblage

sextet and assemblage both are nouns.

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

As nouns, assemblage is a hypernym of sextet; that is, assemblage is a word with a broader meaning than sextet:

Other hypernyms of sextet include gathering.

sextet (noun)	assemblage (noun)
a musical composition written for six performers	the social act of assembling
six people considered as a unit	a system of components assembled together for a particular purpose
a set of six similar things considered as a unit	a group of persons together in one place
six performers or singers who perform together	several things grouped together or considered as a whole
the cardinal number that is the sum of five and one