WordNet (r) 3.0 (2006):

tearoom
    n 1: a restaurant where tea and light meals are available [syn:
         teashop, teahouse, tearoom, tea parlor, tea
         parlour]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "tearoom":
   automat, beanery, bistro, buffet, buvette, cafe, cafeteria,
   canteen, cantina, chophouse, chuck wagon, coffee shop, coffeehouse,
   coffeeroom, cookhouse, cookshack, cookshop, diner, dining hall,
   dining room, dog wagon, drive-in, drive-in restaurant, eatery,
   eating house, fast-food chain, grill, grillroom, hamburger stand,
   hash house, hashery, hot-dog stand, kitchen, lunch counter,
   lunch wagon, luncheonette, lunchroom, mess hall, pizzeria,
   quick-lunch counter, restaurant, smorgasbord, snack bar, tavern,
   trattoria