calumniation vs defamation

calumniation and defamation both are nouns.

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

As nouns, calumniation and defamation are synonyms defined as:

calumniation and defamation: a false accusation of an offense or a malicious misrepresentation of someone's words or actions

Other synonyms of calumniation include calumny, hatchet job, obloquy, traducement.

calumniation (noun)	defamation (noun)
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 false accusation of an offense or a malicious misrepresentation of someone's words or actions