quadrangle vs sleepout

quadrangle

noun
  • A courtyard which is quadrangular. 

  • The buildings forming the border of such a courtyard. 

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

sleepout

noun
  • A veranda or other outbuilding used as a sleeping area. 

  • an organised group of people sleeping in the open, often as a form of protest or to raise public awareness of an issue such as homelessness. 

  • a holiday in Africa where travellers sleep away from their home, generally in an open air safari lodge, private home or guest house. 

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