The Collaborative International Dictionary of English v.0.48:

Taproom \Tap"room`\, n.
   A room where liquors are kept on tap; a barroom.
   [1913 Webster]

         The ambassador was put one night into a miserable
         taproom, full of soldiers smoking.       --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

taproom
    n 1: a room or establishment where alcoholic drinks are served
         over a counter; "he drowned his sorrows in whiskey at the
         bar" [syn: barroom, bar, saloon, ginmill,
         taproom]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "taproom":
   alehouse, bar, barrel house, barroom, beer garden, beer parlor,
   bistro, blind tiger, cabaret, cafe, cocktail lounge, dive,
   dramshop, drinkery, drinking saloon, gin mill, groggery, grogshop,
   honky-tonk, local, nightclub, pothouse, pub, public, public house,
   rathskeller, rumshop, saloon, saloon bar, speakeasy, tap, tavern,
   wine shop