bush jacket vs jacket

bush jacket and jacket both are nouns.

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

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

bush jacket: a loose fitting jacket; resembles a shirt with four patch pockets and a belt
jacket: a short coat

bush jacket (noun)	jacket (noun)
a loose fitting jacket; resembles a shirt with four patch pockets and a belt	a short coat
	an outer wrapping or casing
	(dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
	the tough metal shell casing for certain kinds of ammunition
	the outer skin of a potato

bush jacket (verb)	jacket (verb)
	put a jacket on
	provide with a thermally non-conducting cover