The Collaborative International Dictionary of English v.0.48:

Coxswain \Cox"swain`\ (k?k"sw?n, Colloq. k?k"s'n), n.
   See Cockswain.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "coxswain":
   Gyropilot, automatic pilot, boatheader, boatsteerer, cicerone,
   conner, courier, cowherd, cox, docking pilot, dragoman, drover,
   goatherd, guide, guidepost, guider, helmsman, herd, herdsman,
   mercury, navigator, pilot, pointer, river pilot, sailing master,
   shepherd, steerer, steersman, tour director, tour guide,
   wheelman