The Collaborative International Dictionary of English v.0.48:

Buckshot \Buck"shot`\, n.
   A coarse leaden shot, larger than swan shot, used in hunting
   deer and large game.
   [1913 Webster]

WordNet (r) 3.0 (2006):

buckshot
    n 1: small lead shot for shotgun shells [syn: bird shot,
         buckshot, duck shot]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "buckshot":
   ball, bar shot, bird shot, bullet, cannon shot, cannonball,
   case shot, crossbar shot, duck shot, dumdum bullet,
   expanding bullet, grape, grapeshot, langrel shot,
   manstopping bullet, pellet, rifle ball, round shot, shell, shot,
   shrapnel, slug, split shot