cloister vs quadrangle

cloister

noun
  • A place, especially a monastery or convent, devoted to religious seclusion. 

  • such an arcade in a monastery; 

  • The monastic life. 

  • such an arcade fitted with representations of the stages of Christ's Passion. 

verb
  • To confine in a cloister, voluntarily or not. 

  • To become a Roman Catholic religious. 

  • To deliberately withdraw from worldly things. 

  • To provide with a cloister or cloisters. 

  • To protect or isolate. 

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 cloister and quadrangle occurred in a corpus of books? (source: Google Ngram Viewer )