defamation vs denigration

defamation and denigration both are nouns.

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

As nouns, defamation and denigration are synonyms defined as:

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

Other synonyms of defamation include aspersion, calumny, slander.

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