Fanjet and Jet engine

Fanjet noun - A jet engine in which a fan driven by a turbine provides extra air to the burner and gives extra thrust.

Jet engine and fanjet are semantically related In some cases you can use "Jet engine" instead a noun "Fanjet".

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

Fanjet and jet engine are semantically related in gas airplane engine topic. You can use "Fanjet" instead a noun phrase "Jet engine".