declarer vs avower

declarer and avower both are nouns.

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

As nouns, declarer and avower are synonyms defined as:

Other synonyms of declarer include affirmer, asserter, asseverator.

declarer (noun)	avower (noun)
the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps	someone who admits or acknowledges openly and boldly
someone who claims to speak the truth	someone who claims to speak the truth