affirm vs avow

affirm and avow both are verbs.

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

As verbs, affirm and avow are synonyms defined as:

Other synonyms of affirm include assert, aver, swan, swear, verify.

affirm (verb)	avow (verb)
establish or strengthen as with new evidence or facts	to declare or affirm solemnly and formally as true
to declare or affirm solemnly and formally as true	admit openly and bluntly; make no bones about
say yes to