pea jacket vs jacket

pea jacket and jacket both are nouns.

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

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

pea jacket (noun)	jacket (noun)
a sailor's heavy woolen double-breasted jacket	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

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