ladies' room vs netty

ladies' room

noun
  • A public lavatory intended for use by women. 

  • 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. 

netty

noun
  • Any other place or fixture used for urination and defecation: a lavatory; a toilet. 

  • An outhouse: an outbuilding used as a lavatory. 

adj
  • Netted: made of or employing a net. 

  • Netlike. 

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