[kscaldef]

If you were a teacher marking a student's paper, you would label those as spelling errors, not a grammar errors. The reason is that a different spelling of the words would create the intended sentence. No grammatical variation will do that (reorders, conjugating differently, etc).

[axiak]

Really? Most teachers I had would put WW (wrong word) or WC (word choice) to imply that the word is incorrect, which is considered grammatical.