The Collaborative International Dictionary of English v.0.48:

Coachman \Coach"man\, n.; pl. Coachmen.
   1. A man whose business is to drive a coach or carriage.
      [1913 Webster]

   2. (Zool.) A tropical fish of the Atlantic ocean (Dutes
      auriga); -- called also charioteer. The name refers to
      a long, lashlike spine of the dorsal fin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

coachman
    n 1: a man who drives a coach (or carriage)

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "coachman":
   Jehu, boy, bullwhacker, butler, cabby, cabdriver, cabman, cameleer,
   carter, cartman, charioteer, chauffeur, coachy, cocher, cochero,
   drayman, driver, elephant driver, equerry, gardener, gentleman,
   gharry-wallah, gillie, hack, hackman, hacky, harness racer,
   houseboy, houseman, lord-in-waiting, mahout, man, manservant,
   mule skinner, muleteer, reinsman, skinner, stage coachman,
   teamster, truckman, valet, valet de chambre, vetturino, voiturier,
   wagoner, wagonman, whip