avow vs avower

avow is not a noun while avower is a noun.

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

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

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