prier

/praɪər/
noun
  1. A person who tries to find out information about other people's private lives or affairs, often in an annoying or nosy way.
    • The old prier next door always watches who comes and goes through her curtains.
    • Being a prier won't win you any friends at work.
    • My brother is such a prier; he read my diary when I wasn't home.