| doer(noun, cause, agent, originator) |
| element(noun, cause, agent, originator) |
| explanation(noun, cause, agent, originator) |
| incitement(noun, cause, agent, originator) |
| inducement(noun, cause, agent, originator) |
| leaven(noun, cause, agent, originator) |
| mainspring(noun, cause, agent, originator) |
| maker(noun, cause, agent, originator) |
| matter(noun, cause, agent, originator) |
| motivation(noun, cause, agent, originator) |
| motive(noun, cause, agent, originator) |
| object(noun, cause, agent, originator) |
| occasion(noun, cause, agent, originator) |
| origin(noun, cause, agent, originator) |
| principle(noun, cause, agent, originator) |
| producer(noun, cause, agent, originator) |
| purpose(noun, cause, agent, originator) |
| root(noun, cause, agent, originator) |
| source(noun, cause, agent, originator) |
| stimulation(noun, cause, agent, originator) |