expectation vs promise

expectation and promise both are nouns.

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

As nouns, promise is a hyponym of expectation; that is, promise is a word with a more specific, narrower meaning than expectation:

Other hyponyms of expectation include hope, foretaste, possibility, anticipation, expectancy, apprehension, misgiving.

expectation (noun)	promise (noun)
belief about (or mental picture of) the future	grounds for feeling hopeful about the future
the sum of the values of a random variable divided by the number of values	a verbal commitment by one person to another agreeing to do (or not to do) something in the future
the feeling that something is about to happen
anticipating with confidence of fulfillment

expectation (verb)	promise (verb)
	make a promise or commitment
	promise to undertake or give
	make a prediction about; tell in advance
	give grounds for expectations