1) Attender 2) Auditor 3) Exclusively Saxon word 4) Exclusively Anglo word 5) Hearer 6) Listener 7) Person listening in 8) Snoop 9) Snooper 10) Wiretapper 11) Word of purely Anglo origin 12) Word with Anglo-Saxon origins 1) Hearer 2) Listener 3) Rain 4) Snoop 5) Spy 6) Wiretapper 
• (n.) One who stands under the eaves, or near the window or door of a house, to listen; hence, a secret listener.
Eaves'drop`per noun One who stands under the eaves, or near the window or door of a house, to listen; hence, a secret listener. 
[n] - a secret listener to private conversations
noun a secret listener to private conversations