| Meaning | Category |
| National Academy of Chiropractic Assistants | Business->Professional Organizations |
| National Advisory Committee for Aeronautics | Governmental->NASA Governmental->US Government |
| National Advisory Committee on Aeronautics | Governmental->Transportation |
| National Animal Control Association | Medical->Veterinary |
| National Association for Campus Activities | Academic & Science->Universities |
| National Association of Chinese Americans | Community->Non-Profit Organizations |
| National Association of Conference Activities | Community->Conferences |
| Neighborhood Assistance Corporation of America | Business->Firms |
| Network of Aquaculture Centres in Asia-Pacific | International->Australian |
| Normal Auto Contingency Allegiance | Miscellaneous->Funnies |
| North American Coastal Alliance | Academic & Science->Ocean Science |
| Not A Clone Amplifier | Academic & Science->Electronics |
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