Voyeur
Privacy Invasion
Using 'voyeur' indicates wrongful invasion of someone's private moments.

Installing secret cameras is a voyeur's tactic.
Negative Connotation
'Voyeur' carries a negative judgment, suggesting disapproval of the act.

Her roommate's voyeur habits made her feel unsafe.
Not Just Visual
Being a voyeur can also imply enjoying others' intimate auditory experiences.

The thin walls turned him into an unwilling voyeur.
Compare with
examinerinspectorlook outobserversentinelspysurveyorwatch
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