sort by Rank | Alpha
| Possible Meanings | Rank |
| Health Care Access Initiative | ** |
| human carbonic anhydrase I enzyme | ** |
| human erythrocyte carbonic anhydrase I | ** |
| Highly Charged Atomic Ions | ** |
| Health Care Administration and Informatics | ** |
| Health Care Associated Infection | ** |
| Hawaii Chapter of the Appraisal Institute | ** |
| Home Care Across Illinois | ** |
| Human Carbonic Anhydrase I | * |
| Health Care Auditors Inc | * |
| Holliston Cable Access Inc | * |