Texas tower, air hole, armhole, beacon, belvedere, bleachers, blowhole, bridge, bullet-hole, bunghole, conning tower, cringle, deadeye, eye, eyelet, gallery, gasket, gazebo, grandstand, grommet, guide, keyhole, knothole, lighthouse, lookout, loop, loophole, manhole, mousehole, observation post, observatory, outlook, overlook, peanut gallery, pharos, pigeonhole, pinhole, placket, placket hole, porthole, punch-hole, ringside, ringside seat, sighthole, spiracle, tap, top gallery, tower, vent, venthole, watchtower