prognosticate vs venture

prognosticate is not a noun while venture is a noun.

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

As verbs, venture is a hypernym of prognosticate; that is, venture is a word with a broader meaning than prognosticate:

Other hypernyms of prognosticate include guess, hazard, pretend.

prognosticate (noun)	venture (noun)
	any venturesome undertaking especially one with an uncertain outcome
	a commercial undertaking that risks a loss but promises a profit
	an investment that is very risky but could yield great profits

prognosticate (verb)	venture (verb)
make a prediction about; tell in advance	put forward, of a guess, in spite of possible refutation
indicate, as with a sign or an omen	put at risk
	proceed somewhere despite the risk of possible dangers