prognosticator vs prognosticate

prognosticator is a noun but prognosticate is not a noun.

Word	Noun	Adjective	Verb	Adverb
prognosticator	Yes	No	No	No
prognosticate	No	No	Yes	No

prognosticator (noun)	prognosticate (noun)
someone who makes predictions of the future (usually on the basis of special knowledge)

prognosticator (verb)	prognosticate (verb)
	make a prediction about; tell in advance
	indicate, as with a sign or an omen