promposal vs proposition

promposal and proposition both are nouns.

Word	Noun	Adjective	Verb	Adverb
promposal	Yes	No	No	No
proposition	Yes	No	Yes	No

As nouns, proposition is a hypernym of promposal; that is, proposition is a word with a broader meaning than promposal:

Other hypernyms of promposal include proposal.

promposal (noun)	proposition (noun)
The act of asking someone to go to a prom with you	a task to be dealt with
	(logic) a statement that affirms or denies something and is either true or false
	a proposal offered for acceptance or rejection
	the act of making a proposal
	an offer for a private bargain (especially a request for sexual favors)

promposal (verb)	proposition (verb)
	suggest sex to