avower vs asseverator

avower and asseverator both are nouns.

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

As nouns, avower and asseverator are synonyms defined as:

Other synonyms of avower include affirmer, asserter, declarer.

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