Nationalism 54,885 Natural history 42,396 National security 40,972 Nutrition 30,069 Nobility 28,081 Navigation 27,524 Natural resources 24,810 Nursing 22,790 Names, Geographical 21,855 Newspapers 20,383 Noncitizens 19,356 National parks and reserves 17,429 Navies 17,189 Nature 16,919 National socialism 16,729 Nuclear energy 14,146 Nuclear power plants 14,138 Nervous system 13,926 Neoplasms 13,759 Names, Personal 12,599 Nuclear weapons 11,973 Natural gas 11,667 Names 11,427 Numismatics 9,953 Naval operations 9,600 Natural disasters 9,438 Nonprofit organizations 9,309 Nurses 9,135 Napoleonic Wars, 1800-1815 8,627 Narration (Rhetoric) 8,484 Nanotechnology 8,382 Non-governmental organizations 7,944 Nautical charts 7,697 Nature conservation 7,693 NATURE 7,669 Neurology 7,250 Neurosciences 7,194 Nuclear physics 7,165 Numerical analysis 7,136 Nuclear reactors 7,065 New business enterprises 6,820 Nationalists 6,694 Natural law 6,398 Nuclear nonproliferation 6,263 Nanostructured materials 6,106 Nervous System Diseases 5,730 Neutrality 5,560 Number theory 5,470 Nutritional Physiological Phenomena 5,430 Neolithic period 5,159 National income 4,784 Neoliberalism 4,738 Nuclear disarmament 4,648 Neuropsychology 4,636 Nature in literature 4,570 Nuclear industry 4,530 Noirs américains 4,511 National characteristics, American 4,502 Neural networks (Computer science) 4,489 Natural theology 4,433 Nuclear arms control 4,429 Nuclear warfare 4,386 Naturalists 4,375 Negotiable instruments 4,373 Numerical solutions 4,288 Novelists, English 4,268 Nationalisme 4,232 Navajo Indians 4,142 Noise 4,115 Naval art and science 4,109 Name 4,077 Negotiation 4,047 Notaries 3,940 Nuclear facilities 3,928 Neo-Confucianism 3,861 Nuns 3,860 Naval history 3,765 Neighborhoods 3,738 Novelists, American 3,714 Nazi concentration camps 3,634 Navy-yards and naval stations 3,541 Nervous System 3,537 National songs 3,510 Nazis 3,465 New products 3,455 Nonfiction 3,436 National liberation movements 3,401 National characteristics, Japanese 3,393 Naturalization 3,352 Nutritional aspects 3,350 Neurophysiology 3,342 Nominations for office 3,327 National 3,317 Nursing homes 3,258 National health services 3,225 Nutrition policy 3,191 Newspaper publishing 3,182 Nomads 3,135 Natural language processing (Computer science) 3,106 Nurseries (Horticulture) 3,054