WordNet (r) 3.0 (2006):

coffee shop
    n 1: a small restaurant where drinks and snacks are sold [syn:
         cafe, coffeehouse, coffee shop, coffee bar]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "coffee shop":
   automat, beanery, bistro, buffet, buvette, cafe, cafeteria,
   canteen, cantina, chophouse, chuck wagon, 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, sandwich shop, smorgasbord, snack bar, tavern, tearoom,
   trattoria