Few words which are spelt differently in British and American English are:
Barrister (BE) : Attorney (AE)
The cinema (BE) : The movies (AE)
Flat (BE) : Apartment (AE)
Holiday (BE) : Vacation (AE)
Lavatory (BE) : Bathroom (AE)
Lift (BE) : Elevator (AE)
Favour (BE) : Favor (AE)
Wardrobe (BE) : Dresser (AE)
Barrister (BE) : Lawyer (AE)
Windscreen (BE) : Wind shield (AE)