Source : Webster's Revised Unabridged Dictionary (1913)

Toper \To"per\ (t[=o]"p[~e]r), n.
   One who topes, or drinks frequently or to excess; a drunkard;
   a sot.

Source : WordNet®

toper
     n : a person who drinks alcoholic beverages (especially to
         excess) [syn: {drinker}, {imbiber}, {juicer}] [ant: {abstainer}]