| reason(noun, action, end, drive, cause) |
| motivation(noun, action, charge, feeling, drive) |
| cause(noun, charge, cause, start, reason) |
| grounds(noun, action, cause, reason, object) |
| rationale(noun, action, cause, reason, object) |
| incentive(noun, charge, drive, cause, drug) |
| stimulus(noun, charge, feeling, drive, cause) |
| ground(noun, cause, start, reason, challenge) |
| intention(noun, end, cause, reason, object) |
| basis(noun, cause, start, reason, idea) |
| inducement(noun, charge, drive, cause, desire) |
| object(noun, end, cause, point, reason) |
| provocation(noun, charge, feeling, drive, cause) |
| purpose(noun, end, cause, reason, object) |
| aim(noun, end, cause, reason, use) |
| consideration(noun, cause, reason, piece, object) |
| motif(noun, part, point, line, figure) |
| design(noun, part, end, cause, reason) |
| motor |
| spur(noun, force, charge, feeling, drive) |