crowd vs flock

crowd and flock both are nouns.

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

As nouns, flock is a hyponym of crowd; that is, flock is a word with a more specific, narrower meaning than crowd:

Other hyponyms of crowd include army, crush, jam, press, drove, horde, swarm, huddle, mob, rabble, rout, phalanx, troop.

crowd (noun)	flock (noun)
a large number of things or people considered together	a group of birds
an informal body of friends	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

crowd (verb)	flock (verb)
to gather together in large numbers	come together as in a cluster or flock
cause to herd, drive, or crowd together	move as a crowd or in a group
approach a certain age or speed
fill or occupy to the point of overflowing