Ise Vs Ize Spelling - British Vs American English ... - Learn English

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Common Mistakes and Confusing Words in English

British vs American English American vs British English

-ize or -ise

Many people in the UK believe that words ending in “-ize” such as “organize” are US spellings, and that the correct spelling is “organise”. However, the Oxford University Press insists that words such as computerize, capitalize, capsize, organize, organization, privatize, publicize, realize should take the -ize ending, but that others, eg analyse, advertise, advise, arise, compromise, disguise, despise, enterprise, exercise, merchandise, revise, supervise, surprise should take the -ise ending.

It can be very confusing (and not just for learners). It seems to be a word-ending in flux. Maybe one day it will be -ize all the way. In the meantime...

In the Concise Oxford Dictionary you will often find that both options are possible in British English - 'realise' or 'realize', 'organise' or 'organize' - whilst for other entries -ize is listed as unmistakably American, e.g. 'analyse' = British English, 'analyze' = American English.

Here's a checklist you can use, not rules, just guidelines:-

Noun and verb: Where the noun and verb are the same (like “exercise”), use -ise.

Pronunciation: Anything that doesn't sound like “-eyes” uses -ise, such as “promise”.

Stem: Where the stem word (usually Latin or Greek) ends in “is”, then use -ise, as in vis (to see) gives “televise”.

Anything else: Use -ize.

Confusing Words

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