Answer by Joseph Michael Pallante:
Turn left! turn right!
You use "turn" mostly with directions or something that moves on a pivot point briefly.
Spin around, spin in a chair, my head is spinning. These are all fixed on one point and involve a rotation or series of rotations.
Think of turning as the process for spinning, but to spin you need to complete a circle. For example I can turn down streets going only left or right and complete one circle, yet I had to turn at 3 pivot points.
A turn has pivot points, a spin has 1 central pivot point and rotates in at least 1 circle.