negation vs denial

negation and denial both are nouns.

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

As nouns, denial is a hypernym of negation; that is, denial is a word with a broader meaning than negation:

Other hypernyms of negation include disaffirmation.

negation (noun)	denial (noun)
the speech act of negating	a defendant's answer or plea denying the truth of the charges against him
a negative statement; a statement that is a refusal or denial of some other statement	renunciation of your own interests in favor of the interests of others
(logic) a proposition that is true if and only if another proposition is false	the act of refusing to comply (as with a request)
	the act of asserting that something alleged is not true
	(psychiatry) a defense mechanism that denies painful thoughts