Here are the main ways in which British and American spelling are different.
Words ending in –re
British English words that end in -re often end in -er in American English:
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 |
Words ending in a vowel plus l
In British spelling, verbs ending in a vowel plus l double the l when adding endings that begin with a vowel. In American English, the lis not doubled:
British | US |
travel | travel |
travelled | traveled |
travelling | traveling |
traveller | traveler |
fuel | fuel |
fuelled | fueled |
fuelling | fueling |
Words spelled with double vowels
British English words that are spelled with the double vowels ae or oe are just spelled with an e in American English:
British | US |
leukaemia | leukemia |
manoeuvre | maneuver |
oestrogen | estrogen |
paediatric | pediatric |
Note that in American English, certain terms, such as archaeology, keep the ae spelling as standard, although the spelling with just the e(i.e. archeology) is usually acceptable as well.
Nouns ending with –ence
Some nouns that end with -ence in British English are spelled -ense in American English:
British | US |
defence | defense |
licence | license |
offence | offense |
pretence | pretense |
Nouns ending with –ogue
Some nouns that end with -ogue in British English end with either -og or -oguein American English:
British | US |
analogue | analog or analogue |
catalogue | catalog or catalogue |
dialogue | dialog or dialogue |
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