rap group vs gathering

rap group and gathering both are nouns.

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

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

Other hypernyms of rap group include assemblage.

rap group (noun)	gathering (noun)
a gathering of people holding a rap session	the social act of assembling
	the act of gathering something
	sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching
	a group of persons together in one place