negation vs negate

negation is a noun but negate is not a noun.

Word	Noun	Adjective	Verb	Adverb
negation	Yes	No	No	No
negate	No	No	Yes	No

negation (noun)	negate (noun)
the speech act of negating
a negative statement; a statement that is a refusal or denial of some other statement
(logic) a proposition that is true if and only if another proposition is false

negation (verb)	negate (verb)
	make ineffective by counterbalancing the effect of
	prove negative; show to be false
	deny the truth of
	be in contradiction with