Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "propellant":
   active, airscrew, alcohol, benzine, briquette, burnable, butane,
   carbon, catalyst, charcoal, charge, coal, coke, combustible, dope,
   driver, driving, ethane, ethanol, exhaust, fan, fireball, firing,
   flammable, flammable material, fuel, fuel additive, fuel dope, gas,
   gas carbon, gasoline, heptane, hexane, impeller, impelling,
   impetus, impulse, in motion, incentive, incitation, inflammable,
   inflammable material, isooctane, jet fuel, jet propulsion,
   kerosene, liquid oxygen, methane, methanol, mobile, motile,
   motivation, motivational, motive, motor, moving, natural gas,
   octane, oil, paddle wheel, paraffin, peat, pentane, piston, prop,
   propane, propeller, propelling, propulsion charge, propulsive,
   propulsor, propulsory, provocative, pulsive, pushing,
   reaction propulsion, rocket fuel, rocket propulsion, rotor, screw,
   screw propeller, shoving, spur, stimulant, stirring, thrust,
   transitional, traveling, turbine, turf, twin screws, wheel