The term 'Machine with a Rotor' can be summarized by the word 'Turbine', which is a seven-letter word. A turbine is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. Turbines are commonly used in aircraft engines, power plants, and water turbines. They are also used in industrial applications such as pumps, compressors, and fans. Turbines are typically composed of a rotor, stator, and blades. The rotor is the rotating part of the turbine, while the stator is the stationary part. The blades are the parts that capture the energy from the fluid flow and convert it into useful work.