bet vs promise

bet and promise both are nouns.

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

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

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

bet (noun)	promise (noun)
the act of gambling	grounds for feeling hopeful about the future
the money risked on a gamble	a verbal commitment by one person to another agreeing to do (or not to do) something in the future

bet (verb)	promise (verb)
have faith or confidence in	make a promise or commitment
maintain with or as if with a bet	promise to undertake or give
stake on the outcome of an issue	make a prediction about; tell in advance
	give grounds for expectations