| Meaning | Category |
| 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 Campus Activities | Academic & Science->Universities |
| National Association Of Chinese Americans | Community->Non-Profit Organizations |
| National Association Of Conference Activities | Community->Conferences |
| Nationally Advisory Committee For Aeronautics | Governmental->NASA |
| Neighborhood Assistance Corporation Of America | Business->Firms |
| Network Of Aquaculture Centres In Asia-Pacific | International->Australian |
| North American Coastal Alliance | Academic & Science->Ocean Science |
| North American Committee For Astronautics | Governmental->NASA |
| Not A Clone Amplifier | Academic & Science->Electronics |
| The National Academy Of Chiropractic Assistants | Medical |
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