greasy spoon vs watering hole

greasy spoon

noun
  • An inexpensive diner or other informal restaurant, especially one specializing in frying or grilling. 

watering hole

noun
  • A bar or other local drinking establishment. 

  • A depression in which water collects and where animals come to drink. 

How often have the words greasy spoon and watering hole occurred in a corpus of books? (source: Google Ngram Viewer )