grocery store vs shop floor

grocery store

noun
  • A store where groceries can be purchased; supermarket. 

shop floor

noun
  • The public area of a retail shop, as distinct from the offices and other rooms. 

  • The work area of a workshop, separate from the offices and other rooms. 

How often have the words grocery store and shop floor occurred in a corpus of books? (source: Google Ngram Viewer )