buzz vs pullulate

buzz is a noun but pullulate is not a noun.

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

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

Other hyponyms of buzz include swarm, teem.

buzz (noun)	pullulate (noun)
a confusion of activity and gossip
sound of rapid vibration

buzz (verb)	pullulate (verb)
call with a buzzer	breed freely and abundantly
fly low	produce buds, branches, or germinate
make a buzzing sound	become abundant; increase rapidly
be noisy with activity	move in large numbers
	be teeming, be abuzz