voyeurnoun [ C ]
uk/vwɑːˈjɜːr/us/vwɑːˈjɝː/disapprovinga person who gets sexual pleasure from secretly watching other people in sexual situations, or (more generally) a person who watches other people's private lives:
I felt like a voyeur visiting the war zone and seeing badly injured people being dragged from their bomb-shattered homes.
voyeurism
noun [ U ] uk/ˈvwɑː.jɜː.rɪ.zəm/us/ˈvwɑː.jɝː.ɪ.zəm/
voyeuristic
adjective uk/ˌvwɑː.jɜːˈrɪ.stɪk/us/ˌvwɑː.jəˈrɪs.tɪk/