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- niagara falls
- niagara river
- nian rebellion
- nibelungenlied
- nicaea
- nicaea, council of
- nicene creed
- niche
- nichiren buddhism
- nicholas brothers
- nicholas of verdun
- nicholas, saint
- nickel
- nicopolis actia
- nicopolis, battle of
- nicotine
- nicoya, gulf of
- niello
- nielsen ratings
- niger river
- niger-congo languages
- night of the long knives
- nighthawk
- nightingale
- nightjar
- nightshade family
- nihilism
- nijmegen, treaties of
- nike
- nike inc.
- nile perch
- nile, battle of the
- nilo-saharan languages
- nilot
- nimbarka
- ninety-five theses
- nineveh
- ningxia
- ninhursag
- ninsun
- ninurta
- niobe
- niobid painter
- nippur
- nirvana
- nissan motor co., ltd.
- nitrate
- nitric acid
- nitric oxide
- nitride
- nitrifying bacteria
- nitrite
- nitro compound
- nitrogen
- nitrogen cycle
- nitrogen fixation
- nitrogen narcosis
- nitroglycerin
- nitrous oxide
- nivernais
- njáls saga
- njörd
- noah
- noaide
- nobel prize
- noble gas
- nocturne
- nodule
- noh theatre
- noise
- nok culture
- nökhör
- nomadism
- nome
- non-euclidean geometry
- nonaligned movement
- noncognitivism
- nonconformist
- nondirective psychotherapy
- nongovernmental organization (ngo)
- nonpartisan league
- nonsense verse
- nootka sound controversy
- nora
- nordic skiing
- norepinephrine
- norfolk
- norfolk island
- norfolk island pine
- noricum
- normal distribution
- norman
- norman conquest
- normandy
- normandy campaign
- north africa campaigns
- north america
- north cascades national park
- north down
- north german confederation