| accident | occurrence, event, happening |
| business | event, happening, occurrence |
| casualty | chance occurrence, uncertainty, precariousness |
| chance | event, occurrence, situation [especially, bad] |
| hap | happening, event, occurrence |
| incidency | incident, event, occurrence |
| occasion | occurrence, action, manifestation |
| occurrent | incident, event, occurrence |
| passage | incident, occurrence, event, happening |