contradiction vs contradict

contradiction is a noun but contradict is not a noun.

Word	Noun	Adjective	Verb	Adverb
contradiction	Yes	No	No	No
contradict	No	No	Yes	No

contradiction (noun)	contradict (noun)
the speech act of contradicting someone
(logic) a statement that is necessarily false
opposition between two conflicting forces or ideas

contradiction (verb)	contradict (verb)
	prove negative; show to be false
	deny the truth of
	be resistant to
	be in contradiction with