The best replacement for listener is talker.

The best alternatives to listener are rated as following:
★★★★★  talker
★★★  reader
★★  handler
★★  filter
★★  callback
★  interceptor
★  observer
★  speaker
★  bad listener
★  actionlistener
★  event handler
  poor listener
  action listener
  good talker
  observer java
  good speaker

Your alternative for listener is not listed? Suggest!
Speaking about listener, one probably shouldn't forget about oracle database.

Other search terms related to listener and their ratings are:
★★★★★ oracle database
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listener
talker
reader