Jannette,

I understand that you are talking about a disorder like condition. But my point is that you can build a grammatically correct word, which will be acceptable for a spell checker program, but will be actually different from what you had in mind (mostly apply to typos, though).

For example: people often write "to" instead of "too"; I'm often catching myself writing "it's" instead of "its" for some subliminal reason. e.t.c.