a rocket engine is used to produce thrust by pushing gases out at a high speed
rocket_engine_liquid_fueled is rocket_engine. thruster is rocket. rocket_engine is rocket_propelled_device. rocket_engine_solid_fueled is not rocket_engine. rocket_engine is engine. rocket_engine is part. rocket_fuel is propellant. rocket_engine_solid_fueled is rocket_engine. rocket_engine is not engine. rocket is jet_engine.