The phrase "lunch room" is correct and usable in written English.
You can use it to refer to a room in which people eat lunch, for example, "We should meet up in the lunch room before the presentation."
"He was walking through the lunch room, wearing these awesome boots," she said.
Presumably, in the lunch room, you didn't know you were starting a global craze?
The Four Seasons? "Worse than the lunch room at General Motors".
The rooms that they illuminate, originally gymnasiums and a lunch room, are now spectacular dance studios.
They finally approached the woman who ran the station lunch room.
There was no Astor name affixed to things like air-conditioning or a staff lunch room at an institution.
They are around every dinner table, in every school and lunch room, on the bus and on the television.
But if you have ever shared a cubicle or a lunch room with a St. Bonaventure graduate, you will be exposed to rare levels of loyalty and partisanship.
W. C. Durant invites visitors to luncheon at the Racket Club which turns out to be a lunch room where they eat a 50 cents luncheon.
"Moreover, the home-office investment in furniture, art, Coke dispenser, lunch room, high-tech equipment - you name it - totals $301,363".
While we're encouraging kids to "mix it up" in the lunch room, we need to get them behind the scenes as well.
