A motor is a thing that rotates round and round. You can usually control the direction and speed of rotation but you can't position it accurately without some additional equipment , typically an encoder
Be careful of your terminology, just because an (RC)servo can be driven to a particular angle, don't dismiss 'servo motors' ... ...because that's *exactly* what's inside an RC servo!
One the things inside a servo is indeed a motor. But that's not a good reason enough for referring to the whole servo as though it was just a motor.
if I talked about going for a drive in my car fuel tank people would look at me very strangely.