bed jacket vs jacket

bed jacket and jacket both are nouns.

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

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

bed jacket: a lightweight jacket worn over bedclothes (as when sitting in bed)
jacket: a short coat

bed jacket (noun)	jacket (noun)
a lightweight jacket worn over bedclothes (as when sitting in bed)	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

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