The Collaborative International Dictionary of English v.0.48:

Toper \To"per\ (t[=o]"p[~e]r), n.
   One who topes, or drinks frequently or to excess; a drunkard;
   a sot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tope \Tope\, n.
   1. (Zool.) A small shark or dogfish (Galeorhinus galeus
      syn. Galeus galeus), native of Europe, but found also on
      the coasts of California and Tasmania; -- called also
      toper, oil shark, miller's dog, and penny dog.
      [1913 Webster]

   2. (Zool.) The wren. [Prov. Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

toper
    n 1: a person who drinks alcoholic beverages (especially to
         excess) [syn: drinker, imbiber, toper, juicer]
         [ant: abstainer, abstinent, nondrinker]