witness vs hear

witness is a noun but hear is not a noun.

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

witness (noun)	hear (noun)
testimony by word or deed to your religious faith
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

witness (verb)	hear (verb)
be a witness to	get to know or become aware of, usually accidentally
perceive or be contemporaneous with	perceive (sound) via the auditory sense
	receive a communication from someone
	listen and pay attention
	examine or hear (evidence or a case) by judicial process