refutation vs refute

refutation is a noun but refute is not a noun.

Word	Noun	Adjective	Verb	Adverb
refutation	Yes	No	No	No
refute	No	No	Yes	No

refutation (noun)	refute (noun)
the act of determining that something is false
any evidence that helps to establish the falsity of something
the speech act of answering an attack on your assertions

refutation (verb)	refute (verb)
	prove to be false or incorrect
	overthrow by argument, evidence, or proof