peephole Synonyms

spyhole aperture porthole eyehole pinhole door viewer doorhole peekhole knothole manhole vent slot slit openings peep hole inspection opening ticket window keyholes spy hole sight pigeonhole eyepiece eyelet eyecup eye crevice crack conning tower cleft chink bunghole fissure foramen grommet perforation orifice opening ocellus mousehole loophole lookout keyway keyhole hole armhole