caterer vs grocer

caterer

noun
  • A person employed to obtain and maintain the storage of provisions, especially food. 

  • A person or company hired to provide and serve food, usually for a large group and at a location separate from where the food is prepared. 

grocer

noun
  • A person who retails groceries (foodstuffs and household items) from a grocery. 

verb
  • To sell groceries; to act as a grocer. 

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