creephole
/ˈkriːphoʊl/Definitions
1. noun
A small hole or gap in a wall or other surface, especially one that is used for spying or looking at people.
“She felt like she was being watched through the creephole in her apartment’s wall.”
2. verb
To spy on someone by looking through a small hole or gap in a wall or other surface.
“Someone has been creeping on us by looking through the creephole in the living room wall.”