dining hall vs snack bar

dining hall

noun
  • a large room, typically in schools or colleges, where people eat together 

snack bar

noun
  • A small restaurant serving light meals. 

  • A bar-shaped snack, such as a chocolate bar. 

  • A counter in some other establishment having the same function. 

How often have the words dining hall and snack bar occurred in a corpus of books? (source: Google Ngram Viewer )