There are 1721 words that the Americans spell differently here are a few examples.
centre vs center
colour vs color
litre vs liter
aluminium vs aluminum
behoves vs behooves
bevvy vs bevy
cheque vs check
cypher vs cipher
draught vs draft
omelette vs omelet
plough vs plow
tyre vs tire
yoghurt vs yogurt
judgement vs judgment
catalogue vs catalog
programme vs program
foetus vs fetus
paedophile vs pedophile
enrol vs enroll
terrorise vs terrorize
The Queen would not be impressed! Lol!
But then, Australians slaughter the English language pretty awesomely as well!