Play word 馬鹿穴 馬鹿穴 ばかあな clearance hole (hole for a bolt, screw, etc., which is large enough to allow the thread, etc. to pass through)
Play word 馬場殿 馬場殿 うまばどの building for observing horse racing, horseback archery, etc. (sometimes specifically that used by the emperor on the greater palace grounds)