prognosticative vs prognosticate

prognosticative is an adjective but prognosticate is not an adjective.

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

prognosticative (adjective)	prognosticate (adjective)
of or relating to prediction; having value for making predictions

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