British English to American English: Letter N
Nail varnish Nail polish
Naff = corny, cheesy
Nappy Diaper
Nark Narc
Nasty Mean
Nationalise Nationalize
Naturalise Naturalize
Neat (drink) Straight
Neighbour Neighbor
Net silk Thrown silk
Neurone Neuron
Neutralise Neytralize
Newsagent News stand/Newsdealer
Newsreader Anchorman/news presenter
Nib = pen point
Nightdress Nightgown
Nil zero/zilch
Nissen hut Quonset hut
Nitre Niter
Non-defining nondefining
Nonillion = AE number equal to 10pwr30 / BE equal 10pwr54
Non-issue = a matter no real significance or not as important as thought
Non-judgemental Nonjudgmental
Non-U =
Nought Zero
Noughts and crosses (game) Tic-tac-toe
Normal Regular
Normalise Normalize
Normality Normalcy
Northwards Northward
Notarise Notarize
Note [£10 ~/$10 ~] Bill [£10 ~/$10 ~]
Notepad Scratchpad
Noticeable Noticeable
Noticeboard Bulletin board
Novemdecillion BE n+114 zeros Novemdecillion AE n+60 zeros
Number plate License plate
Nursery Kindergarten
a nurse wit no full qualification = AE practical nurse
Have I missed anything? Send in your American/British differences now.