assure vs affirm

assure and affirm both are verbs.

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

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

Other hypernyms of assure include assert, aver, avow, swan, swear, verify.

assure (verb)	affirm (verb)
be careful or certain to do something; make certain of something	establish or strengthen as with new evidence or facts
inform positively and with certainty and confidence	to declare or affirm solemnly and formally as true
assure somebody of the truth of something with the intention of giving the listener confidence	say yes to
make a promise or commitment
make certain of