overture vs proposition

overture and proposition both are nouns.

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

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

Other hypernyms of overture include proffer, suggestion.

overture (noun)	proposition (noun)
a tentative suggestion designed to elicit the reactions of others	a task to be dealt with
orchestral music played at the beginning of an opera or oratorio	(logic) a statement that affirms or denies something and is either true or false
something that serves as a preceding event or introduces what follows	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)

overture (verb)	proposition (verb)
	suggest sex to