attestant vs attester

attestant and attester both are nouns.

Word	Noun	Adjective	Verb	Adverb
attestant	Yes	No	No	No
attester	Yes	No	No	No

As nouns, attestant and attester are synonyms defined as:

attestant and attester: someone who affirms or vouches for the correctness or truth or genuineness of something

attestant (noun)	attester (noun)
(law) a person who attests to the genuineness of a document or signature by adding their own signature	someone who affirms or vouches for the correctness or truth or genuineness of something
someone who affirms or vouches for the correctness or truth or genuineness of something