denigration vs calumny

denigration and calumny both are nouns.

Word	Noun	Adjective	Verb	Adverb
denigration	Yes	No	No	No
calumny	Yes	No	No	No

As nouns, denigration and calumny are synonyms defined as:

denigration and calumny: an abusive attack on a person's character or good name

Other synonyms of denigration include aspersion, defamation, slander.

denigration (noun)	calumny (noun)
the act of expressing disapproval (especially of yourself)	an abusive attack on a person's character or good name
an abusive attack on a person's character or good name	a false accusation of an offense or a malicious misrepresentation of someone's words or actions
a belittling comment