crowd vs herd

crowd and herd both are nouns.

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

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

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

As verbs, crowd and herd are synonyms defined as:

crowd (noun)	herd (noun)
a large number of things or people considered together	a group of cattle or sheep or other domestic mammals all of the same kind that are herded by humans
an informal body of friends	a group of wild mammals of one species that remain together: antelope or elephants or seals or whales or zebra
	a crowd especially of ordinary or undistinguished persons or things

crowd (verb)	herd (verb)
to gather together in large numbers	move together, like a herd
cause to herd, drive, or crowd together	cause to herd, drive, or crowd together
approach a certain age or speed	keep, move, or drive animals
fill or occupy to the point of overflowing