grevillea vs bush

grevillea and bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
grevillea	Yes	No	No	No
bush	Yes	Yes	Yes	No

As nouns, bush is a hypernym of grevillea; that is, bush is a word with a broader meaning than grevillea:

Other hypernyms of grevillea include shrub.

grevillea (noun)	bush (noun)
any shrub or tree of the genus Grevillea	hair growing in the pubic area
	dense vegetation consisting of stunted trees or bushes
	a large wilderness area
	a low woody perennial plant usually having several major stems

grevillea (adjective)	bush (adjective)
	not of the highest quality or sophistication

grevillea (verb)	bush (verb)
	provide with a bushing