drinker

Short definition from Wiktionary

Noun

1. 1
   Agent noun of drink; someone or something that drinks.
2. 2
   Someone who drinks alcoholic beverages on a regular basis.
3. 3
   A device from which animals can drink.
4. 4
   A pub.
5. 5
   A lasiocampid moth of species Euthrix potatoria, having an orange-brown colour.

Proper noun

1. 1
   A surname