prognosticate vs promise

prognosticate is not a noun while promise is a noun.

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

As verbs, prognosticate and promise are synonyms defined as:

Other synonyms of prognosticate include anticipate, call, forebode, foretell, predict.

prognosticate (noun)	promise (noun)
	grounds for feeling hopeful about the future
	a verbal commitment by one person to another agreeing to do (or not to do) something in the future

prognosticate (verb)	promise (verb)
make a prediction about; tell in advance	make a promise or commitment
indicate, as with a sign or an omen	promise to undertake or give
	make a prediction about; tell in advance
	give grounds for expectations