Linked from
The 38 pages that link to Rocket engine, each with the reason it gives.
TurbofanCompared with: Unlike a turbofan, it does not depend on atmospheric oxygen.
Jet engineCompared with: Unlike an air-breathing jet, it can operate without atmospheric oxygen.
TurbojetCompared with: Unlike a turbojet, it does not depend on atmospheric oxygen.
Aircraft engineCompared with: Unlike air-breathing aircraft engines, rockets carry their oxidizer.