spud vs root vegetable

spud and root vegetable both are nouns.

Word	Noun	Adjective	Verb	Adverb
spud	Yes	No	Yes	No
root vegetable	Yes	No	No	No

As nouns, root vegetable is a hypernym of spud; that is, root vegetable is a word with a broader meaning than spud:

Other hypernyms of spud include starches, solanaceous vegetable.

spud (noun)	root vegetable (noun)
a sharp hand shovel for digging out roots and weeds	any of various fleshy edible underground roots or tubers
an edible tuber native to South America; a staple food of Ireland

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