dairy bar vs milk bar

dairy bar

noun
  • A small establishment serving milk, milkshakes etc. and sometimes light food. 

milk bar

noun
  • A small shop and/or cafe, often part of a larger shop, that sells fast food and a range of dairy based beverages such as milkshakes and ice creams; a deli or delicatessen. 

  • A convenience store. 

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