decree vs declare

decree is a noun but declare is not a noun.

Word	Noun	Adjective	Verb	Adverb
decree	Yes	No	Yes	No
declare	No	No	Yes	No

As verbs, declare is a hypernym of decree; that is, declare is a word with a broader meaning than decree:

decree (noun)	declare (noun)
a legally binding command or decision entered on the court record (as if issued by a court or judge)

decree (verb)	declare (verb)
decide with authority	state emphatically and authoritatively
issue a decree	state firmly
	make a declaration (of dutiable goods) to a customs official
	declare to be
	announce publicly or officially
	proclaim one's support, sympathy, or opinion for or against
	designate (a trump suit or no-trump) with the final bid of a hand
	authorize payments of