Carthusian vs cloisterer

Carthusian

noun
  • A pupil of Charterhouse School (founded in a Carthusian monastery) 

  • A member of a Christian contemplative order of monks founded by Bruno of Cologne (St Bruno) in 1084. 

adj
  • Of, or relating to this order. 

cloisterer

noun
  • One belonging to, or living in, a cloister; a recluse. 

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