Nationalism 54,906 Natural history 42,387 National security 41,001 Nutrition 30,075 Nobility 28,100 Navigation 27,522 Natural resources 24,815 Nursing 22,794 Names, Geographical 21,860 Newspapers 20,388 Noncitizens 19,360 National parks and reserves 17,433 Navies 17,189 Nature 16,935 National socialism 16,741 Nuclear energy 14,149 Nuclear power plants 14,140 Nervous system 13,930 Neoplasms 13,759 Names, Personal 12,600 Nuclear weapons 11,979 Natural gas 11,670 Names 11,428 Numismatics 9,951 Naval operations 9,597 Natural disasters 9,442 Nonprofit organizations 9,318 Nurses 9,136 Napoleonic Wars, 1800-1815 8,633 Narration (Rhetoric) 8,489 Nanotechnology 8,387 Non-governmental organizations 7,947 Nautical charts 7,697 Nature conservation 7,695 NATURE 7,671 Neurology 7,252 Neurosciences 7,198 Nuclear physics 7,165 Numerical analysis 7,139 Nuclear reactors 7,065 New business enterprises 6,827 Nationalists 6,703 Natural law 6,400 Nuclear nonproliferation 6,269 Nanostructured materials 6,110 Nervous System Diseases 5,731 Neutrality 5,558 Number theory 5,470 Nutritional Physiological Phenomena 5,425 Neolithic period 5,166 National income 4,784 Neoliberalism 4,743 Nuclear disarmament 4,648 Neuropsychology 4,634 Nature in literature 4,572 Noirs américains 4,541 Nuclear industry 4,530 National characteristics, American 4,501 Neural networks (Computer science) 4,494 Natural theology 4,435 Nuclear arms control 4,435 Nuclear warfare 4,390 Negotiable instruments 4,383 Naturalists 4,375 Numerical solutions 4,282 Novelists, English 4,270 Nationalisme 4,242 Navajo Indians 4,142 Noise 4,115 Naval art and science 4,107 Name 4,080 Negotiation 4,049 Notaries 3,955 Nuclear facilities 3,928 Nuns 3,863 Neo-Confucianism 3,860 Naval history 3,767 Neighborhoods 3,738 Novelists, American 3,723 Nazi concentration camps 3,641 Navy-yards and naval stations 3,540 Nervous System 3,538 National songs 3,506 Nazis 3,470 New products 3,455 Nonfiction 3,436 National liberation movements 3,402 National characteristics, Japanese 3,392 Naturalization 3,351 Nutritional aspects 3,350 Neurophysiology 3,343 Nominations for office 3,327 National 3,318 Nursing homes 3,258 National health services 3,228 Nutrition policy 3,192 Newspaper publishing 3,182 Nomads 3,138 Natural language processing (Computer science) 3,114 Nurseries (Horticulture) 3,054