The Collaborative International Dictionary of English v.0.48:

passenger \pas"sen*ger\ (p[a^]s"s[e^]n*j[~e]r), n. [OE. & F.
   passager. See Passage, and cf. Messenger.]
   1. A passer or passer-by; a wayfarer. --Shak.
      [1913 Webster]

   2. A traveler by some established conveyance, as a coach,
      steamboat, railroad train, etc.
      [1913 Webster]

   Passenger falcon (Zool.), a migratory hawk. --Ainsworth.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

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