quartet vs assemblage

quartet and assemblage both are nouns.

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

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

Other hypernyms of quartet include gathering.

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