find out vs witness

find out is not a noun while witness is a noun.

Word	Noun	Adjective	Verb	Adverb
find out	No	No	Yes	No
witness	Yes	No	Yes	No

find out (noun)	witness (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

find out (verb)	witness (verb)
get to know or become aware of, usually accidentally	be a witness to
trap; especially in an error or in a reprehensible act	perceive or be contemporaneous with
establish after a calculation, investigation, experiment, survey, or study
find out, learn, or determine with certainty, usually by making an inquiry or other effort