avow vs assure

avow and assure both are verbs.

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

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

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

avow (verb)	assure (verb)
to declare or affirm solemnly and formally as true	be careful or certain to do something; make certain of something
admit openly and bluntly; make no bones about	inform positively and with certainty and confidence
	assure somebody of the truth of something with the intention of giving the listener confidence
	make a promise or commitment
	make certain of