A narrow notch, groove, or opening, as a keyway in a piece of machinery, a slit for a coin in a vending machine, etc.
A gap, breach, or aperture:
A narrow crack or opening; a fissure or cleft.
An opening or perforation:
Find another word for peepholes. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for peepholes, like: slots, slits, openings, eyelets, crevices and holes.