carouser

From carouse +‎ -er.

carouser (plural carousers)

1. A person who carouses; a reveller.
   • 1836, Thomas Frognall Dibdin, Reminiscences of a Literary Life:

     Equally persuaded I am that he was in the habit of receiving, in early youth, certain dicteria — perchance odd heads and tails of rhyming ballads — from some hoary headed sage who had been a carouser at the "merrie court" of James V. of Scotland.

• See also Thesaurus:drunkard