declaration vs declare

declaration is a noun but declare is not a noun.

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

declaration (noun)	declare (noun)
a statement that is emphatic and explicit (spoken or written)
a formal expression by a meeting; agreed to by a vote
(law) unsworn statement that can be admitted in evidence in a legal transaction
a formal public statement
(contract bridge) the highest bid becomes the contract setting the number of tricks that the bidder must make
a statement of taxable goods or of dutiable properties

declaration (verb)	declare (verb)
	state emphatically and authoritatively
	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