What is the difference between 'less' and 'least' and 'more' and 'most'?

Degrees Of Comparison Questions

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What is the difference between 'less' and 'least' and 'more' and 'most'?

The difference between 'less' and 'least' is that 'less' is used to compare two things, while 'least' is used to compare three or more things.

Similarly, the difference between 'more' and 'most' is that 'more' is used to compare two things, while 'most' is used to compare three or more things.