origination vs overture

origination and overture both are nouns.

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

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

origination: an event that is a beginning; a first part or stage of subsequent events
overture: something that serves as a preceding event or introduces what follows

Other hyponyms of origination include germination, cause, preliminary, prelude, emanation, procession, rise.

origination (noun)	overture (noun)
the act of starting something for the first time; introducing something new	a tentative suggestion designed to elicit the reactions of others
an event that is a beginning; a first part or stage of subsequent events	orchestral music played at the beginning of an opera or oratorio
	something that serves as a preceding event or introduces what follows