Flying drainpipe and Jet engine

Flying drainpipe noun - A simple type of jet engine; must be launched at high speed.

Jet engine and flying drainpipe are semantically related. In some cases you can use "Jet engine" instead a noun phrase "Flying drainpipe".

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

Flying drainpipe and jet engine are semantically related. Sometimes you can replace phrase "Flying drainpipe" with "Jet engine", this phrases are similar.