witness vs find out

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

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

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