assassinator vs assassinate

assassinator is a noun but assassinate is not a noun.

Word	Noun	Adjective	Verb	Adverb
assassinator	Yes	No	No	No
assassinate	No	No	Yes	No

assassinator (noun)	assassinate (noun)
a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed

assassinator (verb)	assassinate (verb)
	destroy or damage seriously, as of someone's reputation
	murder; especially of socially prominent persons