The witch trial judges were already covered.
Well then I'd have to say that "grand piano" didn't qualify either - because "piano" was already on the list...
As long as the name or word hasn't been repeated for the same letter, I've seen no problem with it.
S is for Sacreligious, which is what DS was accused of being in a religious tract published by the Jack Chick Company. Also, the portrayal of religious figures on the show could be interpreted as sacreligious.