attestant vs attestor

attestant and attestor both are nouns.

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

As nouns, attestant and attestor are synonyms defined as:

attestant and attestor: (law) a person who attests to the genuineness of a document or signature by adding their own signature

Other synonyms of attestant include attestator, witness.

attestant (noun)	attestor (noun)
(law) a person who attests to the genuineness of a document or signature by adding their own signature	(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