Question

List of words having different spellings in british and american english

Answer 1

British_US

colour_color
flavour_flavor
humour_humor
labour_labor
travel_travel
travelled_traveled
travelling_traveling
traveller_traveler
fuel_fuel
fuelled_fueled
fuelling_fueling
defence_defense
licence_license
offence_offense
pretence_pretense
analogue_analog or analogue
catalogue_catalog or catalogue
dialogue_dialog or dialogue

Answer 2

British US
centre center
fibre fiber
litre liter
theatre theater or theatre
Words ending in -our
British English words ending in -our usually end in -or in American English:

British US
colour color
flavour flavor
humour humor
labour labor
neighbour neighbor
Words ending in -ize or -ise
Verbs in British English that can be spelled with either -ize or -ise at the end are always spelled with -ize at the end in American English:

British US
apologize or apologise apologize
organize or organise organize
recognize or recognise recognize
Words ending in -yse
Verbs in British English that end in -yse are always spelled -yze in American English:

British US
analyse analyze
breathalyse breathalyze
paralyse paralyze