increase vs pullulate

increase is a noun but pullulate is not a noun.

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

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

increase (noun)	pullulate (noun)
the act of increasing something
the amount by which something increases
a change resulting in an increase
a process of becoming larger or longer or more numerous or more important
a quantity that is added

increase (verb)	pullulate (verb)
become bigger or greater in amount	breed freely and abundantly
make bigger or more	produce buds, branches, or germinate
	become abundant; increase rapidly
	move in large numbers
	be teeming, be abuzz