WordNet (r) 3.0 (2006):

rocket propulsion
    n 1: reaction propulsion using stored oxygen for combustion;
         used where there is insufficient atmospheric oxygen

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "rocket propulsion":
   action and reaction, aeromotor, charge, diesel propulsion, exhaust,
   fuel, gas propulsion, gasoline propulsion, jet power,
   jet propulsion, liquid oxygen, plasma-jet propulsion, power plant,
   propellant, propulsion charge, ram-jet propulsion, reaction,
   reaction propulsion, resojet propulsion, rocket power,
   steam propulsion, thrust, turbojet propulsion, wind propulsion