A little help from writers, bloggers, etc.

I'm on a quest, coming up empty. It's a simple question: How do I tweak a spell check program to actually CHECK and REVIEW specific words that I tend to misspell, such as "you're vs. your." I'm looking for a spell check program that lets me add these words to review, or, allows me access to the dictionary, so as to delete words so they will automatically be flagged. Perhaps there are other options too?
I can't seem to find a way to get in the dictionary in Word, or text edit, or any other program. I'd be so grateful for someone who can help figure this out.

Your problem there is that 'you're', 'your' and 'yore' are all correct spellings. Does a grammar check pick it up?

Question to the OP, did you start one of these writers threads over on another Mac site? ;D