(n.) Something that provides thrust; as, an explosive or a fuel\.

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