UK vs USA

AMERICAN - BRITISH

Spelling differences: -or vs. -our

color - colour
favorite - favourite
honor - honour
humor - humour
favor - favour
glamor - glamour

Spelling differences: -ze vs. -se

analyze - analyse
criticize - criticise
memorize - memorise
surprize - surprise
advertize - advertise
improvize - improvise

Spelling differences: -ll vs. -l

enrollment - enrolment
fulfill - fulfil
skillful - skilful
panelled - paneled
enrolled - enroled
fulfilled - fulfiled
empanelled - empaneled
cancelled - canceled

Spelling differences: -er vs. -re

center - centre
meter - metre
theater - theatre
fiber - fibre
kilometer - kilometre
luster - lustre
liber - libre
saber - sabre
sepulcher - sepulchre
somber - sombre

Spelling differences: -og vs. -ogue

analog - analogue
catalog - catalogue
dialog - dialogue

Spelling differences: -e vs. -oe or -ae

encylopedia - encylopaedia
maneuver - manoeuver
medieval - mediaeval

Spelling differences: -ck or -k vs. -que

bank - banque
check - cheque
checker - chequer

Spelling differences: -dg vs. -dge (or -g vs. -gu)

argument - arguement
judgment - judgement

Spelling differences: -ense vs. -enze

defense - defence
license - licence
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Some American words are different from British English words:

apartment - flat
baby carriage - pram
band-aid - plaster
bathroom - loo / WV
chopped beef - mince
can - tin
cookie - biscuit
diaper - nappy
elevator - lift
eraser - rubber
flashlight - torch
gas - petrol
guy - bloke / chap
highway - motorway
jello - jelly
jelly - jam
kerosene - paraffin
lawyer - solicitor
license plate - number plate
line - queue
mail - post
motor home - caravan
movie theater - cinema
pants - trousers
period - full stop
pharmacist - chemist
rent - hire
sidewalk - pavement
soccer - football
trash can - bin
trunk (car) - boot
truck - lorry
vacation - holiday
vest - waistcoat
zip code - postal code