Certain engines are types of machines that use energy to generate mechanical power. Turbos (6 letters) are a type of engine that uses a turbine to compress air and increase the power output of an engine. VSES (4 letters) stands for Variable Speed Electric Starter, which is a type of engine that uses an electric motor to start the engine. Turbines (8 letters) are a type of engine that uses a turbine to convert the energy of a fluid into mechanical energy.