EXAMPLES FROM THE WEB FOR ROCKETSHIP
The other rocketship was a speck, a mote, invisible because of its size and distance.
Once in two weeks Earth-time a rocketship came around the horizon from Lunar City with stores for the colony deep underground.
A rocketship must burn its fuel by chemical explosion in order to push its cargo load upward.
It takes just as much energy to lift an anti-gravity ship as to lift a rocketship.