No, not *those* words! That would be way too obvious! The words my mom wouldn't let us say are the following.
1) "At." This one *is* rather obvious. "Don't end a sentence with 'at'". Most of the time, I don't.
2) "Ain't." In the immortal words of someone whose name I don't remember, "Ain't, ain't right to say." We never really did get into the habit of saying ain't, probably because of her continual insistence.
3) "Lost." Mom's bit of wisdom on this word was, "Don't say 'lost', say 'misplaced.'" Don't know why...and I still say "lost".
4) "Alley" We grew up at the end of a dead end street. Most of our friends lived across the alley...oh, excuse me...across the LANE, as my mom insisted we call it. I guess alley conjured up too many images of mangy cats (and other things I didn't want to think about as a small child.)
So, yeah, those are my mom's words you shouldn't say.