voyeurist

Example:He was a peeper, stalking his ex-girlfriend's home with clandestine cameras.

Definition:A person who secretly watches others, typically for sexual gratification, without their knowledge.

Example:The victim reported the stalker, a voyeurist, to the authorities who had been following her for months.

Definition:Someone who watches or follows another person in a persistent and obsessive manner, often for non-sexual reasons.

Example:After the peeping tom was caught, rampant paranoia surfaced among the tenants in the building.

Definition:A slang term for a person who secretly watches others, typically for sexual pleasure, without their knowledge or consent.