True, but HP and his chums would happily describe each other as witches and sorcerors, whereas I don't see Galadriel referring to herself in these terms.
The words are used positively in the HP books, whereas they have more negative connotations in Tolkien's works. 
Which is why I think 
Lush is spot on when she says:
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				... the real difference lies in rhetoric.
			
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