Wiktionary
catapulter
n. One who uses a catapult.
Usage examples of "catapulter".
A city in space may be slower, but if you have the extra timeand if you're in constant communication with the rest of the solar system anywaythen it's far more comfortable than either a torchship or a catapulter.
The catapulters stood silently and nervously, awaiting their moment of glory.