forecast vs promise

forecast and promise both are nouns.

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

As verbs, promise is a hypernym of forecast; that is, promise is a word with a broader meaning than forecast:

Other hypernyms of forecast include anticipate, call, forebode, foretell, predict, prognosticate.

forecast (noun)	promise (noun)
a prediction about how something (as the weather) will develop	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

forecast (verb)	promise (verb)
judge to be probable	make a promise or commitment
predict 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