The Collaborative International Dictionary of English v.0.48:

Commuter \Com*mut"er\ (k[o^]m*m[=u]"t[~e]r), n.
   One who commutes; especially, one who commutes in traveling.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Commuter \Com*mut"er\ (k[o^]m*m[=u]"t[~e]r), a.
   of or pertaining to commuting, in the sense of traveling;
   used for commuting; as, a commuter airline.
   [PJC]

WordNet (r) 3.0 (2006):

commuter
    n 1: a passenger train that is ridden primarily by passengers
         who travel regularly from one place to another [syn:
         commuter, commuter train]
    2: someone who travels regularly from home in a suburb to work
       in a city

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "commuter":
   adventurer, alpinist, astronaut, camper, climber, comers and goers,
   cosmopolite, cruiser, excursionist, explorer, fare, globe-girdler,
   globe-trotter, goer, hajji, jet set, jet-setter, journeyer,
   mariner, mountaineer, palmer, passenger, passerby, pathfinder,
   pilgrim, pioneer, rubberneck, rubbernecker, sailor, sightseer,
   straphanger, tourer, tourist, trailblazer, trailbreaker, transient,
   traveler, trekker, tripper, viator, visiting fireman, voortrekker,
   voyager, voyageur, wayfarer, world-traveler