George Bernard Shaw once remarked that ‘England and America are two countries separated by a common language’. However, as well as ignoring the Atlantic Ocean, Shaw’s proclamation overlooks the many differences between British and American spelling.
Here though, we’ll look at the systematic ways in which British and American English diverge, as you’ll need to know these if writing for an international audience.
Words we spell with an ‘-our’ in the UK are often simplified in American English, which tends to drop the ‘u’.
UK Spelling
US Spelling
Humour
Humor
Colour
Color
Favourite
Favorite
When an English word ends in ‘-re’, American English reverses this to make the spelling consistent with other English words that end with an ‘-er’ sound.
Centre
Center
Theatre
Theater
Manoeuvre
Maneuver
As with ‘manoeuvre/maneuver’ in the table above, American English also simplifies vowel combinations in some words.
Paediatric
Pediatric
Oestrogen
Estrogen
One of the most common spelling differences between UK and US English is that many American words take a ‘z’ where the British versions can use either ‘s’ or ‘z’.
Organise/Organize
Organize
Recognise/Recognise
Recognize
Apologise/Apologize
Apologize
These variations also apply to modifications of these words, so British English accepts both ‘organisation’ and ‘organization’, while American English only uses ‘organization’.
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Some people claim that using a ‘z’ in these words is only acceptable in American English, but either version is fine as long as you apply consistent spelling throughout.
The one significant exception is when the word is spelled with a ‘-yse’, such as ‘catalyse’ and ‘analyse’; these terms can only be spelt with an ‘s’ in British English, but always take a ‘z’ in American English (e.g. ‘analyze’ and ‘catalyze’).
Another simplification, as American spellings lose the ‘-ue’ from words that end in ‘-ogue’.
Dialogue
Dialog
Analogue
Analog
Catalogue
Catalog
Many words spelled with a soft ‘c’ in British English take an ‘s’ in American English.
Defence
Defense
Offence
Offense
Pretence
Pretense
However, it’s worth noting that the adjectival forms of these words are spelled with an ‘s’ in both UK and US English (e.g. ‘defensive’, ‘offensive’).
Keep in mind, too, that UK terms which differ in spelling when used as either a noun or an adjective (e.g. ‘practice/practise’) often use a single spelling for both forms in US English (so ‘practice’ is both the noun and verb in America).
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