assert vs assure

assert and assure both are verbs.

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

As verbs, assure is a hyponym of assert; that is, assure is a word with a more specific, narrower meaning than assert:

Other hyponyms of assert include hold, claim, take, attest, declare, protest, tell.

assert (verb)	assure (verb)
postulate positively and assertively	be careful or certain to do something; make certain of something
to declare or affirm solemnly and formally as true	inform positively and with certainty and confidence
state categorically	assure somebody of the truth of something with the intention of giving the listener confidence
insist on having one's opinions and rights recognized	make a promise or commitment
	make certain of