Reaction engine and Rocket engine

Reaction engine noun - A jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream.

Rocket engine and reaction engine are semantically related In some cases you can replace phrase "Rocket engine" with "Reaction engine", this phrases are similar.

Rocket engine noun - A jet engine containing its own propellant and driven by reaction propulsion.

Reaction engine and rocket engine are semantically related in jet engine with reaction propulsion topic. You can use "Reaction engine" instead a noun phrase "Rocket engine".