inception vs overture

inception and overture both are nouns.

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

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

inception: 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 inception include germination, cause, preliminary, prelude, emanation, procession, rise.

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