Formal:
* मोटर (motor): This is the most common and direct translation of "motor".
Informal:
* गाड़ी (gaड़ी): This literally means "vehicle" and can be used when referring to a motor vehicle.
* इंजन (injan): This is a general term for "engine" and can be used when referring to a motor.
Specific contexts:
* For electric motors, you can use विद्युत मोटर (vidyut motor).
* For combustion engines, you can use आंतरिक दहन इंजन (antarik dahan injan).
Ultimately, the best word to use depends on the specific situation and the intended meaning.