turn vs reversal

turn and reversal both are nouns.

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

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

Other hyponyms of turn include turn around, swerve, yaw, gyration, revolution, rotation, coming back, return, volution.

turn (noun)	reversal (noun)
the act of changing or reversing the direction of the course	a change from one state to the opposite state
the act of turning away or in the opposite direction	the act of reversing the order or place of
taking a short walk out and back	turning in the opposite direction
a favor for someone	a major change in attitude or principle or point of view
(game) the activity of doing something in an agreed succession	a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
turning or twisting around (in place)	a decision to reverse an earlier decision
a short performance that is part of a longer program	turning in an opposite direction or position
a movement in a new direction	an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
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)

turn (verb)	reversal (verb)
twist suddenly so as to sprain
change to the contrary
go sour or spoil
pass into a condition gradually, take on a specific property or attribute; become
undergo a transformation or a change of position or action
change color
become officially one year older
have recourse to or make an appeal or request for help or information to
direct at someone
shape by rotating on a lathe or cutting device or a wheel
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