The Collaborative International Dictionary of English v.0.48:

Goer \Go"er\, n. [From Go.]
   One who, or that which, goes; a runner or walker; as:
   (a) A foot. [Obs.] --Chapman.
   (b) A horse, considered in reference to his gait; as, a good
       goer; a safe goer.
       [1913 Webster]

             This antechamber has been filled with comers and
             goers.                               --Macaulay.
       [1913 Webster]

WordNet (r) 3.0 (2006):

goer
    n 1: someone who leaves [syn: departer, leaver, goer]