open vs opening

open and opening both are nouns.

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

open (noun)	opening (noun)
information that has become public	a recognized sequence of moves at the beginning of a game of chess
a tournament in which both professionals and amateurs may play	the act of opening something
a clear or unobstructed space or expanse of land or water	becoming open or being made open
where the air is unconfined	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

open (adjective)	opening (adjective)
ready or willing to receive favorably	first or beginning
affording unobstructed entrance and exit; not shut or closed
affording free passage or access
(set theory) of an interval that contains neither of its endpoints
open and observable; not secret or hidden
used of mouth or eyes
ready for business
not having been filled
(of textures) full of small openings or gaps
openly straightforward and direct without reserve or secretiveness
not requiring union membership
open to or in view of all
possibly accepting or permitting
without undue constriction as from e.g. tenseness or inhibition
having no protecting cover or enclosure
affording free passage or view
with no protection or shield
accessible to all
not sealed or having been unsealed
not brought to a conclusion; subject to further thought
not defended or capable of being defended

open (verb)	opening (verb)
make available
become available
make the opening move
cause to open or to become open
become open
spread out or open from a closed or folded state
display the contents of a file or start an application as on a computer
afford access to
start to operate or function or cause to start operating or functioning
begin or set in action, of meetings, speeches, recitals, etc.
have an opening or passage or outlet