| Meaning | Category |
| NATO Standardization Agency | Governmental->United Nations |
| Napier Students Association | Academic & Science->Universities |
| National Safety Associates | Business->Firms |
| National Sanitary Association | Business->Professional Organizations |
| National Sanitation Association | Business->Professional Organizations |
| National Scholars Academy | Academic & Science->Universities |
| National Security Act | Governmental->Military |
| National Security Administratiojn | Miscellaneous->Unfiled |
| National Security Agency | Academic & Science->Electronics Governmental->FBI Files Computing->General Business->International Business Governmental->Military Computing->Security |
| National Security Agency (U.S.) | Governmental->FDA |
| National Security Agent | Miscellaneous->Unfiled |
| National Security Area | Governmental->Military |
| National Security Association | Business->Professional Organizations |
| National Sheep Association | Medical->Veterinary |
| National Shipping Authority | Governmental->Military |
| National Skateboard Association | Business->Professional Organizations |
| National Slag Association | Business->Professional Organizations |
| National Snipers Association | Business->Professional Organizations |
| National Socialist Alliance | Governmental->Politics |
| National Socialists Of America | Miscellaneous->Unfiled |
| National Society Of Astronomy | Miscellaneous->Unfiled |
| National Society Of Athletes | Miscellaneous->Unfiled |
| National Spiritual Assembly | Community->Religion |
| National Standards Association | Governmental->NASA |
| National Stone Association | Business->Professional Organizations |
| National Stroke Association | Community->Non-Profit Organizations |
| National Stronghold Assosiation | Miscellaneous->Unfiled |
| Natsionalna Sportna Akademija | Community->Sports |
| Natsionalna Sportna Akademiya | Academic & Science->Universities |
| Natural Supplement Alternatives | Miscellaneous->Unfiled |
| Naval Suppor Activity | Miscellaneous->Unfiled |
| Naval Support Activity | Governmental->US Government |
| Negative Security Assurance | Computing->Security |
| Neighborhood Statistical Area | Community |
| Net Security Administration | Computing->Security |
| Net Sellable Area | Community->Housing |
| Network Security Appliance | Miscellaneous->Unfiled |
| Network Supported Accounts | Miscellaneous->Unfiled |
| Network System Authority | Computing->Networking |
| Neutron Star Atmosphere | Academic & Science->Astronomy |
| Never Say Anything | Miscellaneous->Funnies |
| New Sliding Arm | Miscellaneous->Unfiled |
| Nichiren Shoshu Of America | Miscellaneous->Unfiled |
| Nippon Students Association | Academic & Science->Universities |
| No Significant Abnormalities | Medical->Physiology |
| No Sprinting Allowed | Miscellaneous->Unfiled |
| No Straight Answers | Miscellaneous->Unfiled |
| No Strings Attached | Miscellaneous->Funnies |
| No Stupid Assholes | Miscellaneous->Funnies |
| No Such Address | Miscellaneous->Unfiled |
| No Such Advenbbs | Miscellaneous->Unfiled |
| No Such Agency | Miscellaneous->Funnies |
| No Such Animal | Internet->Chat Computing->Texting |
| No Suits Allowed | Miscellaneous->Unfiled |
| Non Self Accepting | Community->Educational |
| Non Self Ad | Miscellaneous->Unfiled |
| Non-Seasonally Adjusted | Business->Accounting |
| Non-Service Affecting | Computing->Telecom |
| Non-State Agencies | Governmental->State & Local |
| North Atlantic Treaty Organization (NATO) Standardization Agency | Governmental->Military |
| North Suncoast Associates | Business->Firms |
| Northshore Surfing Association | Business->Professional Organizations |
| Norway, Sweden, and Austria | Regional |
| Norwegian Security Alliance | Miscellaneous->Unfiled |
| Not Seasonally Adjusted | Business->Accounting |
| Not Significantly Aggregated | Miscellaneous->Unfiled |
| Not So Attractive | Miscellaneous->Unfiled |
| Novo Sono Ardesco | Miscellaneous->Unfiled |
| Nukes Sail Away | Governmental->Military |
| Nursing Student Association | Academic & Science->Universities |
| Nursing Students Association | Academic & Science->Universities |
| Nuyan Sangyo America | Business->Firms |
| The National Speakers Association | Miscellaneous->Toastmasters |
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