multitude vs assemblage

multitude and assemblage both are nouns.

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

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

Other hypernyms of multitude include gathering.

multitude (noun)	assemblage (noun)
a large gathering of people	the social act of assembling
the common people generally	a system of components assembled together for a particular purpose
a large indefinite quantity	a group of persons together in one place
	several things grouped together or considered as a whole