- Ni
- Ni-hard
- Ni-hard iron
- Ni-resist
- Ni-resist iron
- niacin
- Niagara
- Niagara Falls
- Niagara River
- Niamey
- nib
- nibbed
- nibble
- nibbler
- Nibelung
- Nibelungenlied
- niblick
- nicad
- Nicaea
- Nicaean
- Nicandra
- Nicandra physaloides
- Nicaragua
- Nicaraguan
- Nicaraguan capital
- Nicaraguan monetary unit
- Niccolo Machiavelli
- Niccolo Paganini
- Nice
- nicely
- Nicene
- Nicene Creed
- niceness
- nicety
- niche
- Nicholas
- Nicholas I
- Nicholas II
- Nicholas V
- Nicholas Vachel Lindsay
- Nichrome
- nick
- nickel
- nickel alloy
- nickel bronze
- nickel note
- nickel silver
- nickel steel
- nickel-and-dime
- nickel-base alloy
- nickel-cadmium accumulator
- nickel-iron accumulator
- nickel-iron battery
- nickelodeon
- nicker
- nicker nut
- nicker seed
- Nicklaus
- nicknack
- nickname
- Nicol prism
- Nicola Amati
- Nicola Sacco
- Nicolas de Malebranche
- Nicolas Leonard Sadi Carnot
- Nicolas Poussin
- Nicolaus Copernicus
- Nicolo Amati
- Nicolson
- Nicosia
- Nicotiana
- Nicotiana alata
- Nicotiana glauca
- Nicotiana rustica
- Nicotiana tabacum
- nicotinamide adenine dinucleotide
- nicotinamide adenine dinucleotide phosphate
- nicotine
- nicotine addiction
- nicotine poisoning
- nicotinic acid
- nictate
- nictation
- nictitate
- nictitating membrane
- nictitation
- NICU
- Nidaros
- nidation
- NIDDM
- nidicolous
- nidifugous
- Nidularia
- Nidulariaceae
- Nidulariales
- nidus
- Niebuhr
- niece
- Niels Abel
- Niels Bohr
- Niels Henrik Abel
- Niels Henrik David Bohr
- Nielsen
- Niemann-Pick disease
- nierembergia
- Nierembergia frutescens
- Nierembergia repens
- Nierembergia rivularis
- Nietzsche
- nifedipine
- niff
- niffy
- nifty
- nigella
- Nigella damascena
- Nigella hispanica
- Nigella sativa
- Niger
- Niger franc
- Niger River
- Niger-Congo
- Niger-Kordofanian
- Niger-Kordofanian language
- Nigeria
- Nigerian
- Nigerian capital
- Nigerian monetary unit
- Nigerien
- nigga
- niggard
- niggardliness
- niggardly
- niggardness
- nigger
- niggle
- niggler
- niggling
- nigh
- nigher
- nighest
- night
- night bell
- night bird
- night blindness
- night club
- night court
- night game
- night heron
- night jasmine
- night jessamine
- night latch
- night letter
- night life
- night lizard
- night owl
- night porter
- night raven
- night rider
- night school
- night shift
- night snake
- night soil
- night terror
- night vision
- night watch
- night watchman
- night-blooming cereus
- night-light
- night-line
- night-robe
- night-sight
- night-stop
- nightbird
- nightcap
- nightclothes
- nightclub
- nightcrawler
- nightdress
- nighted
- nightfall
- nightgown
- nighthawk
- nightie
- nightingale
- nightjar
- nightlife
- nightlong
- nightly
- nightmare
- nightmarish
- nightrider
- nightshade
- nightshirt
- nightspot
- nightstick
- nighttime
- nightwalker
- nightwear
- nightwork
- nigra
- nigrify
- Nigroporus
- Nigroporus vinosus
- NIH
- Nihau
- Nihau Island
- nihil
- nihil obstat
- nihilism
- nihilist
- nihilistic
- nihilistic delusion
- nihility
- Nihon
- NIJ
- Nijinsky
- Nijmegen
- Nike
- Nikita Khrushchev
- Nikita Sergeyevich Khrushchev
- Nikola Tesla
- Nikolaas Tinbergen
- Nikolai Andreyevich Rimski-Korsakov
- Nikolai Andreyevich Rimsky-Korsakov
- Nikolai Ivanovich Bukharin
- Nikolai Ivanovich Lobachevsky
- Nikolai Lenin
- Nikolai Vasilievich Gogol
- nil
- Nile
- Nile crocodile
- Nile River
- nilgai
- Nilgiri Hills
- Nilo-Saharan
- Nilo-Saharan language
- Nilotic
- Nilotic language
- nilpotent
- Nilsson
- nim
- nim tree
- nimble
- nimble Will
- nimble-fingered
- nimbleness
- nimblewill
- nimbly
- nimbus
- nimbus cloud
- NIMBY
- nimiety
- niminy-piminy
- Nimitz
- Nimravus
- Nimrod
- nin-sin
- Nina
- Nina from Carolina
- nincompoop
- nine
- nine iron
- nine times
- nine-banded armadillo
- nine-fold
- nine-membered
- nine-sided
- nine-spot
- ninefold
- ninepence
- ninepenny
- ninepin
- ninepin ball
- ninepins
- niner
- nineteen
- nineteenth
- Nineteenth Amendment
- nineties
- ninetieth
- ninety
- ninety-eight
- ninety-fifth
- ninety-five
- ninety-four
- ninety-nine
- ninety-one
- ninety-seven
- ninety-six
- ninety-three
- ninety-two
- Nineveh
- Ningal
- Ningirsu
- Ningishzida
- Ninhursag
- Ninib
- Ninigi
- Ninigino-Mikoto
- ninja
- ninjitsu
- ninjutsu
- Ninkharsag
- Ninkhursag
- ninny
- ninon
- ninth
- ninth cranial nerve
- Ninth of Ab
- Ninth of Av
- Nintoo
- Nintu
- Ninurta
- Niobe
- niobite
- niobium
- Niobrara
- Niobrara River
- nip
- nip and tuck
- nip off
- Nipa
- Nipa fruticans
- nipa palm
- nipper
- nipping
- nipple
- nipple shield
- Nippon
- Nipponese
- nippy
- NIPR
- niqaabi
- niqab
- nirvana
- Nisan
- Nisei
- nisi
- Nissan
- Nissen hut
- NIST
- nisus
- nit
- Nitella
- niter
- nitid
- nitpick
- nitpicker
- nitramine
- nitrate
- nitrate bacterium
- nitrazepam
- nitre
- nitric
- nitric acid
- nitric bacteria
- nitric bacterium
- nitric oxide
- nitride
- nitrification
- nitrify
- nitril
- nitrile
- nitrite
- nitrite bacterium
- nitro group
- Nitrobacter
- nitrobacteria
- Nitrobacteriaceae
- nitrobacterium
- nitrobenzene
- nitrocalcite
- nitrocellulose
- nitrochloroform
- nitrochloromethane
- nitrocotton
- nitrofuran
- nitrofurantoin
- nitrogen
- nitrogen balance
- nitrogen cycle
- nitrogen dioxide
- nitrogen fixation
- nitrogen mustard
- nitrogen narcosis
- nitrogen oxide
- nitrogen trichloride
- nitrogen-bearing
- nitrogen-fixing
- nitrogenase
- nitrogenise
- nitrogenize
- nitrogenous
- nitroglycerin
- nitroglycerine
- nitrohydrochloric acid
- nitrosobacteria
- Nitrosomonas
- Nitrospan
- Nitrostat
- nitrous
- nitrous acid
- nitrous bacteria
- nitrous bacterium
- nitrous oxide
- nitta tree
- nitty-gritty
- nitweed
- nitwit
- nitwitted
- Nivose
- nix
- Nixon
- Nizhni Novgorod
- Nizhnyi Novgorod