How did they forget it ? What in the fuck doc . Can you report that shit to some medical board ? If your doctor writes you a prescription then you NEED that perscription . What if that was heart medicine ? ?<| sep |> you ' ll find some vagaries in the terminology , but yes . jet really only applies to a turbojet engine whose primary purpose is to create thrust via exhaust . Though I suppose even turbofans generate a lot higher percentage of their thrust from exhaust compared to turboshafts and turboprops . ehhhh . turboshafts don ' t generate thrust at all , or if they do , it ' s simply a byproduct . Turboprops and turbofans are similar from a high level , in that the turbine is driving the primary thrust mechanism a prop or ducted fan . so while it may be true in practice , i ' m not sure this must be the case . you could build a turbofan with very little thrust from the jet , and a turpoprop with high jet thrust if you really wanted to . pretty much all it comes down to is how is the energy ultimately used rotating shaft to do some other work ? turboshaft rotating propeller ? turboprop rotating fan ? turbofan high speed exhaust ? turbojet