activator, animator, appliance, arouser, bunt, butt, clout, compulsion, convenience, drive, driving force, energizer, engine, enginery, facility, fixture, human dynamo, impellent, impelling force, impetus, impulse, impulsion, incentive, incitement, irresistible force, life, locomotion, machine, machinery, mechanical aid, mechanical device, mechanism, mobility, moment, momentum, motility, motivating force, motivity, motor, movableness, power, power plant, power source, propelling, propelment, propulsion, pulsion, push, pushing, restorative, shove, shoving, shunt, spark plug, stimulant, stimulator, stimulus, thrust, tonic, utility