AMERICAN ENGLISH
advisor
analyze
apologize
axe/ax
behavior
catalog/catalogue
center
check
color
councilor
counselor
defense
dialog/dialogue
favor
favorite
enroll
fulfill
gray
honor
humor
install
jeweler
jewelery
curb
labeled
labor
liquor
license
liter
marvelous
meter
neighbor
organize
plow
practice (verb and noun)
program
pajamas
quarreled
realize
signaled
skillful
theater
through, thru
traveled, -ling
tire
BRITISH ENGLISH
adviser
analyse
apologise/apologize
axe
behaviour
catalogue
centre
cheque
colour
councillor
counsellor
defence
dialogue
favour
favourite
enrol
fulfil
grey
honour
humour
instal
jeweller
jewellery
kerb (edge of pavement)
labelled
labour
liqueur
licence
litre
marvellous
metre
neighbour
organize/organise
plough
practise (verb)
practice (noun)
programme
pyjamas
quarrelled
realise/realize
signalled
skilful
theatre
through
travelled, -lling
tyre (on a wheel)
The list of the most important differences between BE and AE
Apart from differences in spelling, there are certain words used by the British that are quite foreign to many Americans. In like manner, many American words are certain to cause the British to raise an eyebrow or two. That said, we can still (for the most part) understand one another.