attestant vs attest

attestant is a noun but attest is not a noun.

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

attestant (noun)	attest (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

attestant (verb)	attest (verb)
	authenticate, affirm to be true, genuine, or correct, as in an official capacity
	provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
	give testimony in a court of law
	establish or verify the usage of