pullulate vs spud

pullulate is not a noun while spud is a noun.

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

As verbs, pullulate and spud are synonyms defined as:

Other synonyms of pullulate include bourgeon, burgeon forth, germinate, shoot, sprout.

pullulate (noun)	spud (noun)
	a sharp hand shovel for digging out roots and weeds
	an edible tuber native to South America; a staple food of Ireland

pullulate (verb)	spud (verb)
breed freely and abundantly	produce buds, branches, or germinate
produce buds, branches, or germinate	initiate drilling operations, as for petroleum
become abundant; increase rapidly
move in large numbers
be teeming, be abuzz