Is a Periodic motion is the same as an Oscillatory motion?

No. They are not the same. The differences between them are tabulated below.

	Oscillatory motion	Periodic motion
1.	It is the to and fro motion of a body around its fixed position	It is a motion that repeats itself after fixed intervals of time.
2.	It can be a periodic motion	It is not an oscillatory motion
3	Example:  Motion of vibrating strings.	Example: Motion of planets around the sun.