assemblage vs social group

assemblage and social group both are nouns.

Word	Noun	Adjective	Verb	Adverb
assemblage	Yes	No	No	No
social group	Yes	No	No	No

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

assemblage (noun)	social group (noun)
the social act of assembling	people sharing some social relation
a system of components assembled together for a particular purpose
a group of persons together in one place
several things grouped together or considered as a whole