Do you know ghouls from goblins and ghosts?
"voyeurism," 1924 (in a translation of Freud), from Greek -skopia "observation" (see scope (n.1)) + -philia. In early use often scoptophilia through a mistake by Freud's translators. Modern form by 1937. Related: Scopophiliac.
scopophilia sco·po·phil·i·a (skō'pə-fĭl'ē-ə)n. See voyeurism.