calumniate vs calumny

calumniate is not a noun while calumny is a noun.

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

calumniate (noun)	calumny (noun)
	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

calumniate (verb)	calumny (verb)
charge falsely or with malicious intent; attack the good name and reputation of someone