hitchhiker

from WordNet (r) 3.0 (2006)

hitchhiker
    n 1: a person who travels by getting free rides from passing
         vehicles

from The Collaborative International Dictionary of English v.0.48

hitchhiker \hitchhiker\ n.
   a person who travels by getting free rides from passing
   vehicles; one who hitchhikes.
   [WordNet 1.5]

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "hitchhiker":
      ambulator, backpacker, foot passenger, foot soldier, foot traveler,
      footslogger, hiker, hoofer, infantryman, jaywalker, marcher,
      paddlefoot, pedestrian, peripatetic, trailsman, tramper, walker,
      walkist

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