open vs turn

open and turn both are nouns.

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

As verbs, turn is a hypernym of open; that is, turn is a word with a broader meaning than open:

Other hypernyms of open include change state.

open (noun)	turn (noun)
information that has become public	the act of changing or reversing the direction of the course
a tournament in which both professionals and amateurs may play	the act of turning away or in the opposite direction
a clear or unobstructed space or expanse of land or water	taking a short walk out and back
where the air is unconfined	a favor for someone
	(game) the activity of doing something in an agreed succession
	turning or twisting around (in place)
	a short performance that is part of a longer program
	a movement in a new direction
	an unforeseen development
	a circular segment of a curve
	(sports) a division of a game during which one team is on the offensive
	a time period for working (after which you will be relieved by someone else)

open (adjective)	turn (adjective)
ready or willing to receive favorably
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)	turn (verb)
make available	twist suddenly so as to sprain
become available	change to the contrary
make the opening move	go sour or spoil
cause to open or to become open	pass into a condition gradually, take on a specific property or attribute; become
become open	undergo a transformation or a change of position or action
spread out or open from a closed or folded state	change color
display the contents of a file or start an application as on a computer	become officially one year older
afford access to	have recourse to or make an appeal or request for help or information to
start to operate or function or cause to start operating or functioning	direct at someone
begin or set in action, of meetings, speeches, recitals, etc.	shape by rotating on a lathe or cutting device or a wheel
have an opening or passage or outlet	let (something) fall or spill from a container
	alter the functioning or setting of
	cause (an object) to assume a crooked or angular form
	to break and turn over earth especially with a plow
	to change orientation or direction
	cause to move around a center so as to show another side of
	cause to move around or rotate
	pass to the other side of
	move around an axis or a center
	to send or let go
	cause to move along an axis or into a new direction
	channel one's attention, interest, thought, or attention toward or away from something
	get by buying and selling
	accomplish by rotating
	undergo a change or development
	cause to change or turn into something different;assume new characteristics