Loop-the-loop and Outside loop

Loop-the-loop noun - A flight maneuver; aircraft flies a complete circle in the vertical plane.

Outside loop and loop-the-loop are semantically related. In some cases you can replace phrase "Outside loop" with "Loop-the-loop", this phrases are similar.

Outside loop noun - A loop consisting of a dive followed by inverted flight followed by a climb that returns to horizontal flight.

Loop-the-loop and outside loop are semantically related. You can use "Loop-the-loop" instead a noun phrase "Outside loop".