lunchroom
noun
°A room reserved for eating food, especially at a business (lunch may or may not be served there).
"We made a point to eat in the lunchroom not at our desks."
°A diner or restaurant that specializes in serving lunch.
"I don't know how they stay in business serving only lunch, but the lunchroom on the corner is cheap and fast so I like it."
synonyms: cafeteria