Difference between Oscillatory motion and vibratory motion

Let's think you pulled a tensile string from up to down just a little bit. Then you see a motion of the string (ie particles of the string go up and down) this motion is very small in amplitude ie called vibration. Now pull a tensile spring with a block under it and the spring's other end is tied and the whole system is vertical and you pull it massively. Then you see the spring going up and down massively that's called oscillation.

The term vibration is used mostly mechanically in space, around a equilibrium point.

Oscillation itself is a more complex phenomenon, can be used usually as a variation usually in time, but it does not have to be mechanical (it can but not only). Oscillation can be used for non-mechanical types of variations too. Whereas vibration can only be mechanical.

Thus, vibration is defined as a type of oscillation.

Vibration is basically mechanical oscillation.

Oscillation happens around one fixed point while vibration happens around two fixed points.