* Motor (noun): a machine that converts energy into mechanical motion
* Motive (noun): a reason or cause for doing something
* Motivate (verb): to provide with a reason or incentive for doing something
* Motorist (noun): a person who drives a motor vehicle
* Motory (adjective): relating to or causing movement
* Motility (noun): the ability to move spontaneously
* Motorized (adjective): powered by a motor
* Motorcade (noun): a procession of motor vehicles
* Motoring (noun): the act of driving a motor vehicle
* Automate (verb): to make something operate automatically using a motor or computer
These are just a few examples. There are many other words with the root "motor" depending on the specific meaning you are looking for.