prognosticate vs prognosticative

prognosticate is not an adjective while prognosticative is an adjective.

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

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

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