All your spelling checker can do is tell you that a word isn’t in its dictionary. That doesn’t mean that it’s wrong, just that the program doesn’t recognize it. And, for that matter, it can’t tell you that you’ve used the wrong word (e.g., used their instead of there) if it’s spelled correctly.
All your spelling checker can do is tell you that a word isn’t in its dictionary. That doesn’t mean that it’s wrong, just that the program doesn’t recognize it. And, for that matter, it can’t tell you that you’ve used the wrong word (e.g., used their instead of there) if it’s spelled correctly.