attestant vs witness

attestant and witness both are nouns.

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

As nouns, attestant and witness are synonyms defined as:

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

Other synonyms of attestant include attestator, attestor.

As nouns, witness is a hypernym of attestant; that is, witness is a word with a broader meaning than attestant:

attestant: someone who affirms or vouches for the correctness or truth or genuineness of something
witness: someone who sees an event and reports what happened

Other hypernyms of attestant include informant, witnesser.

attestant (noun)	witness (noun)
(law) a person who attests to the genuineness of a document or signature by adding their own signature	testimony by word or deed to your religious faith
someone who affirms or vouches for the correctness or truth or genuineness of something	someone who sees an event and reports what happened
	a close observer; someone who looks at something (such as an exhibition of some kind)
	(law) a person who attests to the genuineness of a document or signature by adding their own signature
	(law) a person who testifies under oath in a court of law

attestant (verb)	witness (verb)
	be a witness to
	perceive or be contemporaneous with