asserter vs asseverator

asserter and asseverator both are nouns.

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

As nouns, asserter and asseverator are synonyms defined as:

Other synonyms of asserter include affirmer, avower, declarer.

asserter (noun)	asseverator (noun)
someone who claims to speak the truth	someone who claims to speak the truth