- nongonococcal urethritis
- nguni
- nontaxable
- naiant
- nonalcoholic
- night terror
- non_professional
- nonprofessional
- netpicker
- nebbish
- nebe
- neomembrane
- neoceratodus
- nymphicus hollandicus
- neophron percnopterus
- nuchal plane
- Newfoundland dog
- Newfoundland
- noncrucial
- Nero's crown
- needle blight
- needle cast
- Nierembergia frutescens
- Nierembergia rivularis
- Nierembergia repens
- night latch
- northern pitch pine
- northern white cedar
- new caledonian pine
- norfolk island pine
- Nidulariaceae
- Nidularia
- Neohygrophorus
- Nigroporus
- Neolentinus
- neoromanticism
- newsprint
- nice and
- nutriology
- nimiety
- new zealand dollar
- Newton's law of gravitation
- Newton's law
- Newton's law of motion
- nominal content
- natural resistance
- not bat an eye
- normalizer
- normaliser
- noah webster