bunch vs collection

bunch and collection both are nouns.

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

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

Other hypernyms of bunch include accumulation, aggregation, assemblage.

bunch (noun)	collection (noun)
a grouping of a number of similar things	the act of gathering something together
an informal body of friends	a publication containing a variety of works
any collection in its entirety	request for a sum of money
	several things grouped together or considered as a whole

bunch (verb)	collection (verb)
gather or cause to gather into a cluster
form into a bunch