buttery vs swimming in oil

buttery

noun
  • A room in a university where snacks are sold. 

  • A room for keeping food or beverages; a storeroom. 

adj
  • Made with or tasting of butter. 

  • Resembling butter in some way, such as yellow color or smooth texture. 

  • Marked by insincere flattery; obsequious. 

swimming in oil

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