American and English spelling

British and American spelling

British and American English are different in spelling

Words ending in –re

British English words that end in  -re  often end in  -er  in American English:

m

British:

Centre

Litre

Fibre

Theatre

American:

Center

Fiber

Liter

Theater or theatre

Words ending in -our British English words ending in  -our  usually end in  -or  in American English:

British:

Flavour

Humour

Colour

Labour

Neighbour

Us:

Flavor

Humor

Color

Labor

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

Apologize or apologise

Organize or organise

Recognize or recognise

American

Apologize

Organize

Recognize

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:

Travel

Travelled

Travelling

Traveller

Fuel

Fuelled

American:

Travel

Traveled

Traveling

Traveler

Fuel

Fueled

Nouns ending with –ogue Some nouns that end with  -ogue  in British English end with either  -og  or  -ogue in American English:

British:

Analogue

Catalogue

Dialogue

American:

Analog or analogue

Catalog or catalogue

Dialog or dialogue

The spelling  analogue  is acceptable but not very common in American English;  catalog  has become the US norm, but  catalogue  is not uncommon;  dialogue  is still preferred over  dialog .

References

https://en.oxforddictionaries.com/spelling/british-and-spelling