As nouns the difference between peephole and spyhole
is that peephole is a small hole, opening, or piece of glass, especially in a door, through which to look while spyhole is peephole.
peephole
English
Noun
(
en noun)
A small hole, opening or piece of glass, especially in a door, through which to look.
spyhole
English
Noun
(
en noun)
peephole
*{{quote-news, year=2009, date=September 13, author=Ariane Sherine, title=Golden shower, work=Guardian citation
, passage=Then there is a shuffling sound, and the quiet slide of a
spyhole cover. }}