WordNet (r) 3.0 (2006):

jet propulsion
    n 1: propulsion by means of the discharge of a jet of fluid
         toward the rear

Moby Thesaurus II by Grady Ward, 1.0:

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