dungeon vs quadrangle

dungeon

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

  • A room dedicated to sadomasochistic sexual activity. 

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

verb
  • To imprison in a dungeon. 

quadrangle

noun
  • The buildings forming the border of such a courtyard. 

  • A geometric shape with four angles and four straight sides; a four-sided polygon. 

  • A courtyard which is quadrangular. 

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