thorn apple vs bush

thorn apple and bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
thorn apple	Yes	No	No	No
bush	Yes	Yes	Yes	No

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

Other hypernyms of thorn apple include shrub.

thorn apple (noun)	bush (noun)
any of several plants of the genus Datura	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

thorn apple (adjective)	bush (adjective)
	not of the highest quality or sophistication

thorn apple (verb)	bush (verb)
	provide with a bushing