Peephole

n.

1.

A hole, or crevice, through which one may peep without being discovered.

Noun

1.

peephole - a hole (in a door or an oven etc) through which you can peep Synonyms: spyhole

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