bunch vs flock

bunch and flock both are nouns.

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

As verbs, flock is a hypernym of bunch; that is, flock is a word with a broader meaning than bunch:

Other hypernyms of bunch include clump, cluster, constellate.

bunch (noun)	flock (noun)
a grouping of a number of similar things	a group of birds
an informal body of friends	a group of sheep or goats
any collection in its entirety	a church congregation guided by a pastor
	an orderly crowd
	(often followed by `of') a large number or amount or extent

bunch (verb)	flock (verb)
gather or cause to gather into a cluster	come together as in a cluster or flock
form into a bunch	move as a crowd or in a group