There are key differences between UK and US spelling. In IELTS, you should not mix your spelling. You should choose either British English or American English spelling. This is not the case with accents in the speaking test. In the speaking test, mixed accents are fine.
British and American Spelling Differences
Below are the key differences in spelling between American English and British English writing. However, please note this is not a complete list.I have listed some of the main words that are commonly used in English and IELTS. The list below are organised as UK spelling first and US spelling second.
1) – ise / -ize
In British English spelling, some words end with -ise whereas they end with -ize in American English spelling.
- realise / realize
- sympathise / sympathize
- organise / organize
- specialise / specialize
- authorise / authorize
- criticise / criticize
- recognise / recognize
- characterise / characterize
- standardise / standardize
Also note words ending -yse and -yze, such as analyse / analyze and paralyse / paralyze are spelled differently.
Please note there are exceptions. Nowadays, the following words are spelled the same in both UK and US spelling: surprise, exercise, prize, seize, advise, advertise. There may be other words, but these are the most common.
3) -re / -er
- centre / center
- theatre / theater
- litre / liter
- metre / meter (this also applies to other measurements – km, cm, mm)
- fibre / fiber
4) ller / ler
Note that British English words ending ller have a double “l” compared to the US spelling which is only one “l”.
- traveller / traveler
- levelled / leveled
- cancelled / canceled
- fuelled / fueled
- jewellery / jewelry (jewelery)
This same rule applies to other forms of words such as travelled, travelling.
5) -l / -ll
Now we see the opposite rule to the one above. With UK spelling, some words have one “l”, while in US spelling they have two.
- fulfil / fulfill
- appal / appall
- skilful / skillfull
- unskilful / unskillful
- enrol / enroll
- instil / instill
However, the rule above is limited. Most words are actually spelled the same in both UK and US English: successful, refill, harmful, resourceful, meaningful, thoughtful.
6) -our / -or
- colour / color
- behaviour / behavior
- favourite / favorite
- honour / honor
- flavour / flavor
- neighbour / neighbor
- humour / humor
- labour / labor
Note the word “hour” is spelled the same.
7) -ogue / -og
- dialogue / dialog
- catalogue / catalog
- travelogue / travelog
I hope you found this page useful 🙂 All the best, Liz
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