American vs British Spelling
Most dictionaries include both American and British spelling of words and they usually note the differences in some way...For example:
The word color in an American dictionary can be noted as colo(u)r to point out that it is colour in British English or it may just say color in British "colour".Also See:American vs British GrammarAmerican vs British Vocabulary
The table provides a list of the main differences between British and American spelling.
|British English||American English|
American English spelling sometimes does not double the consonant at the end of a word, while British English spelling does, and it's the other way around in different cases, especially when the consonant is 'l'. See Wikipedia's doubled consonants
for details and more examples.