assassinate vs assassinator

assassinate is not a noun while assassinator is a noun.

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

assassinate (noun)	assassinator (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

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