Lately, I've had a discussion with a friend. I said that spelling mistakes is the same thing as spelling errors. He doesn't agree with me. So, what's the difference? Are both correct?
In normal use, the two phrases mean the same thing.
In a specific context a speaker or writer may say that when he says "error" he means something slightly different than when he says "mistake". But that's true of pretty much any word.
I agree with your friend - a spelling error is where you regularly spell a word wrongly a spelling mistake is where you spell a word wrongly and don't notice.
Spelling error : every time your write friend you write freind and think it's correct.
Spelling mistake : you write wierd just once and don't notice, but you normally write weird.
Spelling mistakes are easy to make but not always easy to notice, spelling errors are unnoticeable (by you) and mean you need to learn how to spell the word correctly.
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I found this which seems to confirm my position.
Wikipedia contributors. "Error (linguistics)." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 23 Oct. 2013. Web. 29 Aug. 2014.
In linguistics, it is considered important to distinguish errors from mistakes. Distinction is always made between errors and mistakes where the former is seen as resulting from learner's lack of proper grammatical knowledge and the latter as being failed to utilize a known system correctly. ...