turning vs turn around

turning and turn around both are nouns.

Word	Noun	Adjective	Verb	Adverb
turning	Yes	No	No	No
turn around	Yes	No	Yes	No

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

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

turning (noun)	turn around (noun)
the act of changing or reversing the direction of the course	turning in an opposite direction or position
act of changing in practice or custom
the activity of shaping something on a lathe
the end-product created by shaping something on a lathe
a movement in a new direction
a shaving created when something is produced by turning it on a lathe

turning (verb)	turn around (verb)
	improve significantly; go from bad to good
	improve dramatically
	turn abruptly and face the other way, either physically or metaphorically