Nationalism 54,808 Natural history 42,385 National security 40,924 Nutrition 30,065 Nobility 28,065 Navigation 27,519 Natural resources 24,764 Nursing 22,787 Names, Geographical 21,844 Newspapers 20,382 Noncitizens 19,350 National parks and reserves 17,428 Navies 17,188 Nature 16,913 National socialism 16,722 Nuclear energy 14,142 Nuclear power plants 14,138 Nervous system 13,924 Neoplasms 13,754 Names, Personal 12,592 Nuclear weapons 11,970 Natural gas 11,666 Names 11,426 Numismatics 9,944 Naval operations 9,599 Natural disasters 9,428 Nonprofit organizations 9,308 Nurses 9,133 Napoleonic Wars, 1800-1815 8,626 Narration (Rhetoric) 8,481 Nanotechnology 8,374 Non-governmental organizations 7,942 Nautical charts 7,696 Nature conservation 7,690 NATURE 7,667 Neurology 7,249 Neurosciences 7,193 Nuclear physics 7,163 Numerical analysis 7,135 Nuclear reactors 7,063 New business enterprises 6,817 Nationalists 6,683 Natural law 6,398 Nuclear nonproliferation 6,261 Nanostructured materials 6,106 Nervous System Diseases 5,728 Neutrality 5,557 Number theory 5,468 Nutritional Physiological Phenomena 5,420 Neolithic period 5,155 National income 4,783 Neoliberalism 4,736 Nuclear disarmament 4,647 Neuropsychology 4,636 Nature in literature 4,566 Nuclear industry 4,530 National characteristics, American 4,501 Neural networks (Computer science) 4,485 Noirs américains 4,467 Natural theology 4,432 Nuclear arms control 4,428 Nuclear warfare 4,385 Naturalists 4,373 Negotiable instruments 4,373 Numerical solutions 4,286 Novelists, English 4,268 Nationalisme 4,212 Navajo Indians 4,140 Noise 4,115 Naval art and science 4,108 Name 4,073 Negotiation 4,047 Notaries 3,940 Nuclear facilities 3,928 Nuns 3,859 Neo-Confucianism 3,844 Naval history 3,764 Neighborhoods 3,737 Novelists, American 3,713 Nazi concentration camps 3,634 Navy-yards and naval stations 3,541 Nervous System 3,537 National songs 3,507 Nazis 3,462 New products 3,454 Nonfiction 3,429 National liberation movements 3,399 National characteristics, Japanese 3,389 Naturalization 3,352 Nutritional aspects 3,349 Neurophysiology 3,341 Nominations for office 3,327 National 3,317 Nursing homes 3,258 National health services 3,224 Nutrition policy 3,191 Newspaper publishing 3,181 Nomads 3,132 Natural language processing (Computer science) 3,105 Nurseries (Horticulture) 3,054