rap group vs assemblage

rap group and assemblage both are nouns.

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

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

Other hypernyms of rap group include gathering.

rap group (noun)	assemblage (noun)
a gathering of people holding a rap session	the social act of assembling
	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