promise vs vaticinate

promise is a noun but vaticinate is not a noun.

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

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

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

promise (noun)	vaticinate (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)	vaticinate (verb)
make a promise or commitment	predict or reveal through, or as if through, divine inspiration
promise to undertake or give	foretell through or as if through the power of prophecy
make a prediction about; tell in advance
give grounds for expectations