What are the units of acceleration in SI. Could other units of acceleration exist?

The acceleration of a body a is a value that shows how much the body’s velocity ΔV has changed per unit time t: a = ΔV / t.
Since the main unit for measuring speed is m / s, and time is s, the main unit for measuring acceleration is m / s ^ 2.
According to Newton’s 2 law, the acceleration of a body is determined by the formula: a = F / m, where F is the force that acts on the body, m is the mass of the body.
Since the unit of measurement of force F is Newton, and body mass is kg, the unit of measurement of acceleration will be N / kg.
a {m / s ^ 2}, {N / kg}.