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]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "goer":
   Jehu, adventurer, alpinist, astronaut, camper, climber,
   comers and goers, commuter, cosmopolite, cruiser, departer,
   emigrant, emigre, excursionist, explorer, fare, flier,
   globe-girdler, globe-trotter, hajji, hell-driver, horse racer,
   hummer, hustler, jet set, jet-setter, jockey, journeyer, leaver,
   mariner, mountaineer, out-migrant, palmer, passenger, passerby,
   pathfinder, pilgrim, pioneer, racer, rubberneck, rubbernecker,
   runner, sailor, scorcher, sightseer, sizzler, speed demon, speeder,
   stepper, straphanger, tourer, tourist, trailblazer, trailbreaker,
   transient, traveler, trekker, tripper, turfman, viator,
   visiting fireman, voortrekker, voyager, voyageur, wayfarer,
   world-traveler