What difference between stabilizer and regulator?

in servo stabilizer voltage deviation is less(nearly+-1),in stabilizer it is +-10.The reason is in stabilizer there is only 3 or 4 out put based on input,but servo stabilizer works with servo motor therefor it will vary the out put with input through its movement over the transformer coils ,out put is taking from the contact portion of the servo motor with the generator coil.in stabilizer out put is taking from some intervals .