spud vs bourgeon

spud is a noun but bourgeon is not a noun.

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

As verbs, spud and bourgeon are synonyms defined as:

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

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

spud (verb)	bourgeon (verb)
produce buds, branches, or germinate	produce buds, branches, or germinate
initiate drilling operations, as for petroleum