Aside from the already mentioned Word Games forum, could you also make Music, and some of its subforums exceptions?
The reason I ask this is because Music, and a good chunk of its subforums, have
Official threads for certain bands, which, to quote the thread I just linked, "...serve to cut down on some of the spam and repeat threads within the Music forum..."
The official threads, however, are not stickies, and a lot of them go without use for a pretty long time. A lot of the creators of said threads are no longer active on the site either. The new anti-necro thing basically makes it impossible for a good chunk of official threads to be used, which is going to make the amount of repeats rise.