rotational motion is the motion which always take circular path.Periodic motion means motion that repeats with the same inter-well of time.earth rotation is an eg. of rotational motion, at the same time it is a periodic motion.

Rotational motion is motion which emulates that of the minute hand of a clock. Oscillating motion is motion which emulates that of the pendulum.

the spinning of earth around its axis, the motion of fan are some examples of rotational motion.

The rotational analog of force in linear motion is "Torque".

I think all rotational motion are periodic. There is not possible of nonperiodic