A rocket that uses water as a propellant, which is forced out of the rocket by compressed gas (typically compressed air)

a rocket that is powered by a thermal source, such as a nuclear-thermal rocket or a solar-thermal rocket or a rocket powered by an energy beam such as a laser or microwave beam

A rocket-propelled car

A single rocket that may be attached to other similar rockets to increase the delta-v of the aggregated rocket vehicle

(astronautics) a rocket that uses a chemical reaction of its propellants to generate its gaseous exhaust

A rocket that uses liquid propellants. / A rocket engine that uses liquid propellants.

A rocket vehicle capable of reaching space (typically from the ground).

(US politics, dated) A moderate or liberal member of the Republican Party of the United States of America, especially one from the northeast of the USA.

A sudden, violent collapse of rock under stress, especially in a mine

(informal, vulgar) A jet of mucus deliberately expelled from one's nostril.