cloakroom vs necessarium

cloakroom

noun
  • A lavatory, now particularly a small secondary lavatory or a men's room. 

  • A room intended for holding luggage, as at an airport. 

  • A private lounge next to a legislative chamber. 

  • A room intended for holding guests' cloaks and other heavy outerwear, as at a theater or night club. 

necessarium

noun
  • A lavatory. 

  • Synonym of reredorter: a monastery's latrine, outhouse, or lavatory, typically located behind the dormitory. 

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