Source : Webster's Revised Unabridged Dictionary (1913)

Boozer \Booz"er\, n.
   One who boozes; a toper; a guzzler of alcoholic liquors; a
   bouser.

Source : WordNet®

boozer
     n : a person who drinks alcohol to excess habitually [syn: {alcoholic},
          {alky}, {dipsomaniac}, {lush}, {soaker}, {souse}]