Why is the force that moves an airplane forward called THRUST and not PULL?
Thrust is the force reaction from accelerating a gas from here to over there.  If the element creating the thrust, a propeller, is in front of the engine, it's called a "tractor" configuration because it's pulling the engine, like a tractor (any normal front engine airplane).  If the prop is at the back, or more correctly, behind the engine, it's a pusher configuration (A Lake Buccaneer amphibian is a pusher even though the engine is amidships, not at the tail, because the prop is on the back of the engine itself).  Lots of other designs have put the prop all the way at the back.

In a jet engine, you don't really have an element pushing or pulling the engine itself because the thrust reaction is actually happening inside the engine, mostly in the area ahead the convergent nozzle of the tailpipe where the flow is forced to accelerate. So for jet engines it's just thrust.