proposition vs overture

proposition and overture both are nouns.

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

As nouns, overture is a hyponym of proposition; that is, overture is a word with a more specific, narrower meaning than proposition:

Other hyponyms of proposition include breath, hint, intimation, ghost, touch, trace, advance, approach, feeler.

proposition (noun)	overture (noun)
a task to be dealt with	a tentative suggestion designed to elicit the reactions of others
(logic) a statement that affirms or denies something and is either true or false	orchestral music played at the beginning of an opera or oratorio
a proposal offered for acceptance or rejection	something that serves as a preceding event or introduces what follows
the act of making a proposal
an offer for a private bargain (especially a request for sexual favors)

proposition (verb)	overture (verb)
suggest sex to