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I have a lot of extra work. = I have alot of additional work. ?

That mean extra (adj) and additional (adj) have the same meaning and interchangeable. Right?

If not, how to distinguish them?

Q
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It's a matter of register.

additional is from a higher register than extra.

CJ
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It's a matter of register.

What do you mean?

Q
See Yet.

CJ