assure vs declare

assure and declare both are verbs.

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

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

assure (verb)	declare (verb)
be careful or certain to do something; make certain of something	state emphatically and authoritatively
inform positively and with certainty and confidence	state firmly
assure somebody of the truth of something with the intention of giving the listener confidence	make a declaration (of dutiable goods) to a customs official
make a promise or commitment	declare to be
make certain of	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