bush vs wilderness

bush and wilderness both are nouns.

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

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

Other hypernyms of bush include wild.

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

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

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