sort by Rank | Alpha
| Possible Meanings | Rank |
| National AIDS Control Organization | **** |
| National Associations of Counties | *** |
| National Angel Capital Organization | *** |
| National Association of Colliery Overmen | *** |
| National Association of Counties Organization | *** |
| National Association of Conservation | *** |
| National Association of Co Operative | *** |
| National Aeronautical Chart Office | *** |
| National Association of Community | ** |
| Nigerian Association in Colorado | ** |
| National AIDS Control Office | ** |
| National Assoc of Counties | ** |
| National Assn of Counties | ** |
| National Assocation of Counties | ** |
| National Association of Counties the Only | ** |
| Nonlinear and Adaptive Control | ** |
| National Association of County Organizations | ** |
| Native American Communications Office | ** |
| Nevada Association of County | ** |
| National Association of Corrosion | ** |
| Northampton Afro Caribbean Organisation | ** |
| National Association of Canadian Optician | ** |
| Name Authorities Co Operative | ** |
| National Advisory Committee for the Oceans | ** |
| National Association of Court | ** |
| National Aeronautic Charting Office | * |
| National Aeronautical Charting Organization | * |
| Navy Acquisition Contracting Officer | * |
| Navy Acquisition and Contracting Officer | * |
| Navy Acquisition Career Officer | * |