turning vs reversal

turning and reversal both are nouns.

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

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

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

turning (noun)	reversal (noun)
the act of changing or reversing the direction of the course	a change from one state to the opposite state
act of changing in practice or custom	the act of reversing the order or place of
the activity of shaping something on a lathe	turning in the opposite direction
the end-product created by shaping something on a lathe	a major change in attitude or principle or point of view
a movement in a new direction	a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
a shaving created when something is produced by turning it on a lathe	a decision to reverse an earlier decision
	turning in an opposite direction or position
	an unfortunate happening that hinders or impedes; something that is thwarting or frustrating