affair vs assemblage

affair and assemblage both are nouns.

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

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

Other hypernyms of affair include social event, gathering.

affair (noun)	assemblage (noun)
a vaguely specified concern	the social act of assembling
a formal or official social gathering or ceremony of people	a system of components assembled together for a particular purpose
a usually secretive or illicit sexual relationship	a group of persons together in one place
	several things grouped together or considered as a whole