gathering vs collection

gathering and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
gathering	Yes	No	No	No
collection	Yes	No	No	No

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

Other hypernyms of gathering include aggregation, assembling, collecting.

gathering (noun)	collection (noun)
the social act of assembling	the act of gathering something together
the act of gathering something	a publication containing a variety of works
sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching	request for a sum of money
a group of persons together in one place	several things grouped together or considered as a whole