| tonic(noun, drug, boost, spur, upper) |
| trigger(noun, charge, cause, start, boost) |
| action(noun, feeling, drive, cause, pleasure) |
| aggravation(incitement, goading, needling) |
| aid(noun, support, help, praise, cheer) |
| antecedent(noun, cause, reason, object, purpose) |
| attraction(noun, encouragement, incentive) |
| bang(noun, charge, cause, boost, informal) |
| bribe(noun, encouragement, lure, incentive, bait) |
| call |
| charge(noun, cause, boost, spur, incentive) |
| come-on(noun, reason, spur, encouragement, lure) |
| compulsion(noun, trouble, drive, power, cause) |
| consideration(noun, cause, reason, object, spur) |
| cue |
| energizer(drug, spur, upper, alcohol, stimulant) |
| enforcement(noun, trouble, power, cause, strength) |
| excitant(noun, start, drug, beginning, incentive) |
| exhilaration(noun, pleasure, excitement, enthusiasm, encouragement) |
| exhortation(noun, reason, spur, lure, motivation) |