These are both examples of catapults, broadly, siege engines that use stored energy to make big projectile go over there real good.
What people tend to refer to when they say “catapult” is a mangonel or onager, and go on to imply that the trebuchet is not a catapult. It is a catapult, just a different kind. Much like we have cars, which are vehicles, but we also have trucks, which are also vehicles.
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