promise vs augur

promise and augur both are nouns.

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

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

Other hyponyms of promise include read, outguess, second-guess, bet, wager, calculate, forecast, prophesy, vaticinate.

promise (noun)	augur (noun)
grounds for feeling hopeful about the future	(ancient Rome) a religious official who interpreted omens to guide public policy
a verbal commitment by one person to another agreeing to do (or not to do) something in the future

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