a jet engine containing its own propellant and driven by reaction propulsion

• booster, booster rocket, booster unit, multistage rocket, takeoff booster, takeoff rocket — the first stage of a multistage rocket
• nuclear rocket — a rocket engine in which a nuclear reactor is used to heat a propellant
• retrorocket — a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course
• space rocket — a rocket powerful enough to travel into outer space
• thruster — a small rocket engine that provides the thrust needed to maneuver a spacecraft

• jet engine — a gas turbine produces a stream of hot gas that propels a jet plane by reaction propulsion

• rocket — any vehicle propelled by a rocket engine