flock vs assemble

flock is a noun but assemble is not a noun.

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

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

Other hypernyms of flock include foregather, forgather, gather, meet.

flock (noun)	assemble (noun)
a group of birds
a group of sheep or goats
a church congregation guided by a pastor
an orderly crowd
(often followed by `of') a large number or amount or extent

flock (verb)	assemble (verb)
come together as in a cluster or flock	create by putting components or members together
move as a crowd or in a group	collect in one place
	get people together