If you’re someone learning English, the differences in spelling may be confusing, especially if you look at American versus British English spelling. The order of certain letters can be different depending on which variation (type) is spoken, or there can even be some extra letters (like those extra Us. I’m lookin’ at you, Brits).

English wasn’t standardized (where something should be done the same way for everyone) until the mid to late 18th century, so for a good while there, people spelled words all sorts of ways. In the States, we have a tendency (like to) to prefer to spell things the way they sound – thanks to Noah Webster. Some of the most common differences in American versus British Englist spelling are -o/ -ou, -ize/ -iseand-er/ -re.

Here are 7 words with their American versus British English spellings (with American spellings first) to give you an idea of the differences in our shared language:


I can’t say why, but I always thought the British spelling of programme with its extra m and e always looked fancier. Sometimes, certain words in British English have an extra consonant (a letter that is not a, e, i, o, or u). In this case, programme comes from French modern use, though the British would use the spelling for program for anything computer related. Don’t let it throw you (confuse you), though! You’ll soon figure out which is which.


The –ize / -ise ending is a pretty typical US / UK spelling identifier. However, this difference goes on the list of how the British evolved the English language – not the Americans! (This is a topic for another blog!)

The ize ending has been used since around the 15th century, while –ise only made its first appearance in the UK in the 18th century! As Kate Burridge points out in her book, Blooming English, this suffix comes from the Greek –izein, so using the former (first in the list) version is not only more historically accurate, but is also written closer to how it sounds.


There are many words in American English that use the suffix -or instead of –our, for example, honor, color, behavior, and humor. This –or ending is taken from the original Latin word, whereas –our comes from the French influence on the Latin word. So, did the Americans “take out” the U, or did the British “add” it? I’ll let you decide.


The -er versus -re spelling can be very confusing… even for a native speaker. Centre originates in Old French, though Shakespeare, Milton, and Pope all used center in their writing. There are so many examples of how inconsistent (not regular) this ending is in both spelling and pronunciation, but here are a few words that are spelled the same in both the US and the UK: massacre, mother, December, genre, and oyster.


There are a few random words have different American and British English spellings, and curb/kerb is one of them. Curb comes from Latin, and kerb comes from…English. In the 1660s, someone just decided to spell curb differently and voilà: kurb.

Practice / Practise

Unlike the words advice and advise where the change in letter results in a different word completely, practice and practise mean the same thing. Similar to -ize/-ise, the Brits have taken the French influenced spelling and the Americans have taken on the original Latin version.


This is another where I sometimes use the British spelling instead. There are certain words, like traveling/travelling or focusing/ focussing that are spelled with a double consonant in British English. It can even be confusing for Americans! This really is a huge topic so if you are interested, I recommend starting here.  My advice: just be consistent (stay the same) with your doublings.

Good luck with your spellings! There’s never really a dull moment when learning English, is there?

Do you have any other favo(u)rite American versus British English spelling differences? Share them with us in the comments below!

Did you like this blog? Share it with others! Let us know what YOU think!

Check out these other popular blogs: Taboo words in English7 Synonyms for Being Drunk7 American English Slang Words, or these Sports Idioms used in English!

Erin Duffin lives in Hamburg, is an English teacher, blogger, and yoga instructor, and finds it hard to be loyal to just one English!

Looking for more phrases, ways to use English every day, or get the conversation started? Sign up for our newsletter or check out the website!