doublet vs jacket

doublet and jacket both are nouns.

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

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

doublet (noun)	jacket (noun)
a man's close-fitting jacket; worn during the Renaissance	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

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