There are several areas in which British and American spelling are different. The differences often come about because British English has tended to keep the spelling of words it has absorbed from other languages (e.g. French), while American English has adapted the spelling to reflect the way that the words actually sound when they're spoken.
If you're writing for British readers, you should only use British spellings. In one or two cases, the preferred American spellings are acceptable in British English as well, especially the –ize/-ization endings. While you can use both the –ise/-isation or the –ize/ization endings in British English, it's important to stick to one style or the other throughout the same piece of writing.
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 |
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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 |
| apologizeorapologise | apologize |
| organizeororganise | organize |
| recognizeorrecognise | 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 l is not doubled:
| British | US |
| travel | travel |
| travelled | traveled |
| travelling | traveling |
| traveller | traveler |
| fuel | fuel |
| fuelled | fueled |
| fuelling | fueling |
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