bushman's poison vs bush

bushman's poison and bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
bushman's poison	Yes	No	No	No
bush	Yes	Yes	Yes	No

As nouns, bush is a hypernym of bushman's poison; that is, bush is a word with a broader meaning than bushman's poison:

Other hypernyms of bushman's poison include shrub.

bushman's poison (noun)	bush (noun)
evergreen shrub or tree of South Africa	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

bushman's poison (adjective)	bush (adjective)
	not of the highest quality or sophistication

bushman's poison (verb)	bush (verb)
	provide with a bushing