| contributor(noun, power, fuel, causes) |
| fire(noun, drive, power, desire, inspiration) |
| generator(noun, desire, urge, spur, lure) |
| implementer |
| inclination(noun, feeling, drive, passion, desire) |
| instrument(noun, desire, urge, spur, lure) |
| stimulation(noun, charge, cause, start, reason) |
| transformer(noun, desire, urge, spur, lure) |
| activator(noun, substance, agent, chemical) |
| gas(noun, substance, agent, chemical) |
| induction(noun, power, agent, motive) |
| instigator(noun, desire, urge, spur, lure) |
| wish(noun, feeling, drive, passion, desire) |
| actuation(noun, feeling, drive, passion, desire) |
| alterer(noun, desire, urge, spur, lure) |
| appeal(noun, feeling, drive, passion, desire) |
| boost(noun, charge, cause, desire, urge) |
| causer(noun, desire, urge, spur, lure) |
| compulsion(noun, desire, stick, urge, whip) |
| culprit(noun, power, fuel, causes) |