Listener
Part of speech: noun
Definition: Someone who listens, especially to a speech or a broadcast. A function that runs in response to an event; an event handler.
Example sentence: I think a good director is a good listener.
Auditor
Part of speech: noun
Definition: One who audits bookkeeping accounts.In many jurisdictions, an elected or appointed public official in charge of the public accounts; a comptroller.One who audits an academic course; who attends the lectures but does not earn academic credit.One trained to perform spiritual guidance procedures.