noun (n)

• a person who drinks liquids(noun.person)

  source: wordnet30
• a person who drinks alcoholic beverages (especially to excess)(noun.person)

  Synonym:
  imbiber, juicer, toper
  Antonym:
  abstainer, abstinent, nondrinker
  

  source: wordnet30
• One who drinks; as, the effects of tea on the drinker; also, one who drinks spirituous liquors to excess; a drunkard.(noun)

  source: webster1913