assassination vs calumniation

assassination and calumniation both are nouns.

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

As nouns, calumniation is a hypernym of assassination; that is, calumniation is a word with a broader meaning than assassination:

assassination: an attack intended to ruin someone's reputation
calumniation: a false accusation of an offense or a malicious misrepresentation of someone's words or actions

Other hypernyms of assassination include calumny, defamation, hatchet job, obloquy, traducement.

assassination (noun)	calumniation (noun)
murder of a public figure by surprise attack	a false accusation of an offense or a malicious misrepresentation of someone's words or actions
an attack intended to ruin someone's reputation