witness vs learn

witness is a noun but learn is not a noun.

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

witness (noun)	learn (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)	learn (verb)
be a witness to	gain knowledge or skills
perceive or be contemporaneous with	get to know or become aware of, usually accidentally
	be a student of a certain subject
	commit to memory; learn by heart
	impart skills or knowledge to
	find out, learn, or determine with certainty, usually by making an inquiry or other effort