Some people think when a word is spelled correctly but used incorrectly, that is a spelling mistake. I disagree. If a person intended to use a different word, but through a spelling misstep used another word which happens to be spelled correctly, that is a grammar mistake my friend.
Take this example; We passed a truck the other day and snapped this photo. The word used is breath, but the correct word is breathe. This is not a spelling mistake, this is a grammar mistake.
grammar mistake
The same holds true when someone means to type “I liked the concert” but instead types “I licked the concert”. Because the word “licked” is spelled correctly, the mistake defaults to a grammar error when read by a third party. The author knows the intent and may consider it a spelling mistake, but to a reader who can only guess at the meaning based on context, it is a grammar issue.
This following is an example of a typical marketing person’s spelling error, which I liken to using the word “fone” in place of the word “phone”. To me, both cases betray the author of having at least some level of mental retardation. - DAMN! Upload did not work properly and I killed the original before realizing it 
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spelling mistake
gotcha! this is a grammar mistake!
Ahh… The White Ho… classic