The word motor refers to a power source that converts electrical, chemical or thermal energy into mechanical energy. Some synonyms for the word motor include engine, machine, apparatus, motorcar, propulsion system, powerhouse, motor vehicle, and generator. These words are often used interchangeably, especially when referring to machinery and automotive devices. In some contexts, the word motor can also be replaced by terms such as motorized, powered, operated, driven, and energized, depending on the specific usage. Overall, the word motor has many different synonyms that can be used to describe a range of mechanical and electrical devices.