Jet engine and Jet propulsion

Jet engine noun - A gas turbine produces a stream of hot gas that propels a jet plane by reaction propulsion.

Jet propulsion and jet engine are semantically related. In some cases you can use "Jet propulsion" instead a noun phrase "Jet engine".

Jet propulsion noun - Propulsion by means of the discharge of a jet of fluid toward the rear.

Jet engine and jet propulsion are semantically related. You can use "Jet engine" instead a noun phrase "Jet propulsion".