Discover 10 commonly confused words that spellcheck won’t catch, and learn simple ways to spot them before they slip into your documents.

Is it ‘that’ or ‘which’?

Learn the difference between ‘that’ and ‘which’, when commas matter and how to choose the right option for clear, consistent writing.

Is it ‘practice’ or ‘practise’?

A simple guide to ‘practice’ and ‘practise’ in UK English, with easy ways to remember which spelling is the noun and which is the verb.

Is it ‘licence’ or ‘license’?

Confused by ‘licence’ and ‘license’? Learn the difference between the noun and verb forms, and how they’re used differently in UK and US English.

Is it ‘affect’ or ‘effect’?

Learn the difference between ‘affect’ and ‘effect’ with practical examples, tricks to keep them in mind and the awkward exceptions.

Is it ‘principle’ or ‘principal’?

A straightforward guide to ‘principle’ and ‘principal’, with tips to help you choose the right word for the right meaning.

Is it ‘fewer’ or ‘less’?

Learn the difference between ‘fewer’ and ‘less’, when each should be used and the common exceptions that often cause confusion.

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Proofreading advice and tips