The Collaborative International Dictionary of English v.0.48:

Teamster \Team"ster\, n.
   One who drives a team.
   [1913 Webster]

WordNet (r) 3.0 (2006):

teamster
    n 1: the driver of a team of horses doing hauling
    2: someone who drives a truck as an occupation [syn: teamster,
       trucker, truck driver]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "teamster":
   Jehu, Sunday driver, backseat driver, bullwhacker, bus driver,
   busman, cabby, cabdriver, cabman, cameleer, carter, cartman,
   charioteer, chauffeur, coachman, coachy, cocher, cochero, drayman,
   driver, elephant driver, gharry-wallah, hack, hackdriver, hackman,
   hacky, harness racer, hit-and-run driver, jitney driver, joyrider,
   mahout, motorist, mule skinner, muleteer, reinsman, road hog,
   skinner, speeder, stage coachman, taxidriver, truck driver,
   trucker, truckman, vetturino, voiturier, wagoner, wagonman, whip