promise vs prognosticate

promise is a noun but prognosticate is not a noun.

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

As verbs, promise and prognosticate are synonyms defined as:

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

promise (noun)	prognosticate (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

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