| Rank | Abbreviation | Meaning |
|---|
| ***** | PCWS | Primary Chilled Water Supply
| |
| **** | PCWS | Presbyterian Church of Western Springs
| |
| **** | PCWS | Public Community Water System
| |
| *** | PCWS | Pakistan Christian Welfare Society
| |
| *** | PCWS | Primate Conservation Welfare Society
| |
| ** | PCWS | Program Committee for World Service
| |
| ** | PCWS | Pitch Control Wheel Steering
| |
| ** | PCWS | Perth Coastal Waters Study
| |
| ** | PCWS | pulmonary capillary wedge pressures
| |
| * | PCWS | Public Community Water Supply
| |
| * | PCWS | Project on Cold War Studies
| |
| * | PCWS | Pacific Crest Wind Symphony
| |
| * | PCWS | Peabody Company Will Scarlet
| |
| * | PCWS | Peabody Coal Will Scarlet
| |
| * | PCWS | Philippine Centre for Water and Sanitation
| |
| * | PCWS | Philippine Center for Water Sanitation
| |
| * | PCWS | Private Community Wastewater Systems
| |
| * | PCWS | Pittsburgh Contemporary Writers Series
| |
| * | PCWS | Pecos Western Corp.
| |
| * | PCWS | Personal Computer Work Station
| |
| * | PCWS | Pamlico County Water System
| |
| * | PCWS | Pinellas County Water System
| |
| * | PCWS | Pennsylvania Culinarys Web Site
| |
| * | PCWS | Pure Clear Water Supply
| |
| * | PCWS | Private Communal Water System
| |