promise vs promisor

promise and promisor both are nouns.

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

promise (noun)	promisor (noun)
grounds for feeling hopeful about the future	a person who makes a promise
a verbal commitment by one person to another agreeing to do (or not to do) something in the future

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