What the difference between a motor starter and contactor?

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“A contactor is really just an overgrown relay. It is but one component of a starter and is rated by voltage. The contactor applies voltage to a contactor coil to close the contacts and to supply and interrupt power to the circuit.

A motor starter is simply a contactor PLUS an overload relay and is rated by motor HP ir amperage. If there is no overload relay it is not a starter any longer. It’s back to being just a contactor. The starter employs overload relays to ptotect the motor from load surges by shutting it down to prevent overheating.”

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Author: https://eecoonline.com/contactor-or-motor-starter/