cloakroom attendant vs ladies' room

cloakroom attendant

noun
  • A person who works in a cloakroom (a room intended for holding guests' cloaks and other heavy outerwear, as at a theater or night club). 

ladies' room

noun
  • A room belonging to or intended for some or all women 

  • A waiting room in a railway station or other public building intended exclusively for women and usually including a separate women's lavatory. 

  • A public lavatory intended for use by women. 

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