wilderness vs bush

wilderness and bush both are nouns.

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

As nouns, bush is a hyponym of wilderness; that is, bush is a word with a more specific, narrower meaning than wilderness:

Other hyponyms of wilderness include barren, waste, wasteland, frontier.

wilderness (noun)	bush (noun)
a bewildering profusion	hair growing in the pubic area
a wild and uninhabited area left in its natural condition	dense vegetation consisting of stunted trees or bushes
(politics) a state of disfavor	a large wilderness area
	a low woody perennial plant usually having several major stems

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

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