avower vs avow

avower is a noun but avow is not a noun.

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

avower (noun)	avow (noun)
someone who admits or acknowledges openly and boldly
someone who claims to speak the truth

avower (verb)	avow (verb)
	to declare or affirm solemnly and formally as true
	admit openly and bluntly; make no bones about