crowd vs pullulate

crowd is a noun but pullulate is not a noun.

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

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

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

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

crowd (verb)	pullulate (verb)
to gather together in large numbers	breed freely and abundantly
cause to herd, drive, or crowd together	produce buds, branches, or germinate
approach a certain age or speed	become abundant; increase rapidly
fill or occupy to the point of overflowing	move in large numbers
	be teeming, be abuzz