crowd vs swarm

crowd and swarm both are nouns.

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

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

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

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

Other hyponyms of crowd include mass, overcrowd, pour, pullulate, stream, teem, herd, jam, mob, pack, pile, throng.

crowd (noun)	swarm (noun)
a large number of things or people considered together	a group of many things in the air or on the ground
an informal body of friends	a moving crowd

crowd (verb)	swarm (verb)
to gather together in large numbers	move in large numbers
cause to herd, drive, or crowd together	be teeming, be abuzz
approach a certain age or speed
fill or occupy to the point of overflowing