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Can we say 'correct usage' and 'wrong usage' of a word? Or should 'use' be used instead?
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They are extremely similar. Most of the time either will do fine. I usually say correct usage, but sometimes I say correct use just to provide some variety. use is, of course, applicable to all sorts of situations outside the discussion of language. usage is less so.

CJ
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Usage is the right word here. Use is only tolerated. See 1c:
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http://www.m-w.com/dictionary/usage
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Thanks, CJ, for your reply.

I was surprised when someone who claims to an English lecturer told me some time ago it's wrong to use 'wrong usage'. But I referred to a dictionary and found 'correct usage' being used with regard to a word. A few days later, I saw in a book on English, 'wrong usage' used, also in regard to a word.
 Marius Hancu's reply was promoted to an answer.
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Marius HancuUsage is the right word here. Use is only tolerated. See 1c:
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http://www.m-w.com/dictionary/usage

Thanks, Marius, for confirming what CJ told me.