Synonyms for Eaves-dropper:

• n.

  •monitor (noun)
  • director,
  • counselor,
  • informant,
  • guide,
  • adviser,
  • overseer,
  • auditor,
  • supervisor.

• Other synonyms:

  •n.
  • invigilator,
  • listener,
  • monitor,
  • watchdog,
  • invigilators,
  • watchdogs.