- nilpotent group
- nilpotent matrix
- nilpotent product
- nilpotent ring
- nim
- nimbi
- nimble
- nimble-fingered
- nimble-footed
- nimble-witted
- nimbleness
- nimbus
- nimiety
- niminy-piminy
- nimonic alloy
- nincompoop
- nine
- nine test
- ninefold
- ninepins
- nineteen
- nineteenth
- nineteeth
- nineties
- ninetieth
- ninety
- ninhydrin reaction
- ninhydrin test
- ninny
- ninny-hammer
- nintake manifold
- ninth
- ninthly
- niobe
- niobium
- nip
- nip pressure
- nipped
- nipper
- nipper joint
- nipper pliers
- nippers
- nippers pliers
- nipping
- nipping fork
- nipple
- nipple chuck
- nipple grease
- nipple seat
- nipponese
- nippy
- nipt
- nirvana
- niryana
- nisei
- nisi
- nissenhut
- nisus
- nit
- nit-picking
- nitake outlet
- niter
- niter cake
- nitery
- nitid
- nitinol
- nitly
- nitometer-luxmeter
- niton
- nitosyl
- nitpicking
- nitranite
- nitrate
- nitrate base
- nitrated cellulose
- nitrated steel
- nitration
- nitre
- nitremia
- nitric
- nitric acid
- nitric ester
- nitric oxide
- nitridation
- nitride
- nitride hardening
- nitrided steel
- nitriding
- nitriding furnace
- nitriding process
- nitriding steel
- nitrification
- nitrifier
- nitrify
- nitrifying bacteria
- nitrile rubber
- nitrite
- nitrituria
- nitro-group
- nitro-substitution