lunchroom

from WordNet (r) 3.0 (2006)

lunchroom
    n 1: a restaurant (in a facility) where lunch can be purchased

from The Collaborative International Dictionary of English v.0.48

lunchroom \lunchroom\ n.
   a dining room (in a school, business, or other non-domestic
   facility) where lunch can be purchased.
   [WordNet 1.5]

from Moby Thesaurus II by Grady Ward, 1.0

46 Moby Thesaurus words for "lunchroom":
      automat, beanery, bistro, buffet, buvette, cafe, cafeteria,
      canteen, cantina, chophouse, chuck wagon, coffee, 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, mess hall, pizzeria,
      quick-lunch counter, restaurant, smorgasbord, snack bar, tavern,
      tearoom, trattoria