sort by Rank | Alpha
| Possible Meanings | Rank |
| Atlanta Probe Owners Club | **** |
| Anglo Persian Oil Company | *** |
| Alaska Public Offices Commission | *** |
| African Programme for Onchocerciasis Control | *** |
| American Palm Oil Council | *** |
| African Programme for the Control | *** |
| Asia Pacific Optical Communications | *** |
| Asia Pacific Orchid Conference | *** |
| Autonomist People of Color | *** |
| agglomerative phase of comminution | ** |
| African Program for Onchocerciasis Control | ** |
| African Programme on Onchocerciasis Control | ** |
| Atlanta Paralympic Organizing Committee | ** |
| Advanced Paging Operator Code | ** |
| Appointed Personnel Organization Council | ** |
| acute pseudo-obstruction of the colon | ** |
| Asian Pacific Orthodontic Conference | ** |
| 1-(9-anthryl)-2-propyl chloroformate | ** |
| Advanced Paging Operators Code | ** |
| Advanced Paging Operations Code | * |
| Anomalous Pulmonary Origins of the Coronaries | * |
| Army Post Office Corps | * |
| Advance Post Office Check | * |