prognostic vs predictive

prognostic is a noun but predictive is not a noun.

Word	Noun	Adjective	Verb	Adverb
prognostic	Yes	Yes	No	No
predictive	No	Yes	No	No

As adjectives, prognostic and predictive are synonyms defined as:

prognostic and predictive: of or relating to prediction; having value for making predictions

Other synonyms of prognostic include prognosticative.

prognostic (noun)	predictive (noun)
a sign of something about to happen

prognostic (adjective)	predictive (adjective)
of or relating to prediction; having value for making predictions	of or relating to prediction; having value for making predictions