sort by Rank | Alpha
| Possible Meanings | Rank |
| National Program Officer | **** |
| Non Profit Organisation | **** |
| Non Profit Organisations | **** |
| National Preservation Office | **** |
| Not for Profit Organization | **** |
| Not for Profit Organizations | **** |
| National Planning Office | **** |
| National Police Office | **** |
| National Philharmonic Orchestra | **** |
| Non Property Owner | **** |
| National Partner Organization | *** |
| New Park Office | *** |
| New Planetary Order | *** |
| National Professional Officers | *** |
| Network Performance Optimisation | *** |
| National Partnership Office | *** |
| Not for Profit Organisations | *** |
| Nuclear Power Outlook | *** |
| Non Profitable Organization | *** |
| North Pacific Ocean | *** |
| New Philharmonia Orchestra | *** |
| Negative or Positive | *** |
| Norwegian Project Office | *** |
| National Printing Office | *** |
| National Professional Officer | *** |
| National Patent Offices | *** |
| Nashville Philharmonic Orchestra | *** |
| Nurse Practitioners of Oregon | *** |
| Na Prova Objetiva | *** |
| Nucleus Pontis Oralis | *** |
| National Programs Office | *** |
| National Productivity Organizations | *** |
| Neighborhood Planning Office | *** |
| National Programme Officer | *** |
| New Professionals Orientation | *** |
| Neighborhood Police Officer | ** |
| 1-naphthyl propylene oxide | ** |
| 2'-(4-nitro-phenoxy)oxirane | ** |
| negative-pressure oscillation | ** |
| Neurogenic pulmonary oedema | ** |
| neurotic personality organization | ** |
| normal pregnancy outcome | ** |
| nucleus praetectalis olivaris | ** |
| numerous percutaneous osteoperforations | ** |
| Norwegian Patent Office | ** |
| National Partner Organisations | ** |
| Non Profit Organaization | ** |
| Nothing per Oral | ** |
| Nicastro Piscopo Ogrin | ** |
| 1-naphthylpropylene oxide | ** |
| 2'-(4-nitrophenoxy)oxirane | ** |
| Neuveu Pelletier Organisation | ** |
| 3-(p-nitrophenoxy)propylsilyl | ** |
| Non for Profit Organizations | ** |
| Neighborhood Partnerships Office | ** |
| Neighbourhood Police Officers | ** |
| National Productivity Organisation | ** |
| National Project Officer | ** |
| Neighborhood Patrol Officer | ** |
| No Profit Organization | ** |
| Next Planet Over | ** |
| Nuclear Propulsion Office | ** |
| Neighborhood Preservation Ordinance | ** |
| New Philharmonic Orchestra | ** |
| Nederlandse Professional Organizers | ** |
| Nigerian Press Organisation | ** |
| Non Profit Organazation | ** |
| Non Purchase Order | ** |
| NoordHollands Philharmonisch Orkest | ** |
| National Priest Organization | ** |
| Non Political Organisations | ** |
| Named Pilots Only | ** |
| National Post Office | * |
| National Program Offices | * |
| Nauchno Proizvodstvennoye Obyedineniye | * |
| Network Performance Option | * |
| Network Project Office | * |
| Nuclear Process Operators | * |
| National Prosecution Office | * |
| Natural Product Occurrence | * |
| Niet Planmatig Onderhoud | * |
| National Pathways Office | * |
| Navigation Programme Office | * |
| New Product Operations | * |
| Nigeria Press Organisation | * |
| Naga People Organization | * |
| New Products Office | * |
| Navy Petroleum Office | * |
| Nuclear Plant Operator | * |
| New Pacifica Order | * |
| Names of Present Owners | * |
| Naturopathic Physicians Online | * |
| Network Professional Organizatio | * |
| Network Professional Organization | * |
| Non Passerine Orders | * |