sort by Rank | Alpha
| Possible Meanings | Rank |
| Ohio Partnership for Traffic Safety | ** |
| Options for People Through Services | * |
| Options for Persons Through Services | * |
| Office of Pesticide and Toxic Substances | * |
| Organization for Physical Therapy Students | * |
| Office of Pesticide and Toxic Substance | * |
| Office of Pesticides and Toxic Substances | * |