coatroom vs ladies' cloakroom

coatroom

noun
  • A room intended for holding guests' coats and other heavy outerwear, as at a theater; a cloakroom. 

ladies' cloakroom

noun
  • A cloakroom intended for use by women. 

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