flower bud vs bud

flower bud and bud both are nouns.

Word	Noun	Adjective	Verb	Adverb
flower bud	Yes	No	No	No
bud	Yes	No	Yes	No

As nouns, bud is a hypernym of flower bud; that is, bud is a word with a broader meaning than flower bud:

flower bud: a bud from which only a flower or flowers develop
bud: a swelling on a plant stem consisting of overlapping immature leaves or petals

flower bud (noun)	bud (noun)
a bud from which only a flower or flowers develop	a swelling on a plant stem consisting of overlapping immature leaves or petals
	a partially opened flower

flower bud (verb)	bud (verb)
	develop buds
	start to grow or develop