initiatory vs opening

initiatory is not a noun while opening is a noun.

Word	Noun	Adjective	Verb	Adverb
initiatory	No	Yes	No	No
opening	Yes	Yes	No	No

initiatory (noun)	opening (noun)
	a recognized sequence of moves at the beginning of a game of chess
	the act of opening something
	becoming open or being made open
	the first of a series of actions
	a vacant or unobstructed space that is man-made
	an entrance equipped with a hatch; especially a passageway between decks of a ship
	an aperture or hole that opens into a bodily cavity
	a possible alternative
	the initial part of the introduction
	the first performance (as of a theatrical production)
	a ceremony accompanying the start of some enterprise
	an open or empty space in or between things
	opportunity especially for employment or promotion

initiatory (adjective)	opening (adjective)
serving to set in motion	first or beginning