The Collaborative International Dictionary of English v.0.48:

Drunkard \Drunk"ard\, n. [Drunk + -ard.]
   One who habitually drinks strong liquors immoderately; one
   whose habit it is to get drunk; a toper; a sot.
   [1913 Webster]

         The drunkard and glutton shall come to poverty. --
                                                  Prov. xxiii.
                                                  21.
   [1913 Webster]

WordNet (r) 3.0 (2006):

drunkard
    n 1: a chronic drinker [syn: drunkard, drunk, rummy,
         sot, inebriate, wino]