denial vs negation

denial and negation both are nouns.

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

As nouns, negation is a hyponym of denial; that is, negation is a word with a more specific, narrower meaning than denial:

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