dungeon vs root cellar

dungeon

noun
  • An underground prison or vault, typically built underneath a castle. 

  • A room dedicated to sadomasochistic sexual activity. 

  • An area inhabited by enemies, containing story objectives, treasure and bosses. 

verb
  • To imprison in a dungeon. 

root cellar

noun
  • A structure built underground or partially underground and used to store vegetables, fruits, and nuts or other foods. 

verb
  • To cellar (food) in a root cellar. 

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