ladies' room vs loo

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. 

loo

noun
  • A lavatory: a room used for urination and defecation. 

  • An act that prompts such a penalty. 

  • A hot dust-bearing wind found in Bihar, Uttar Pradesh and the Punjab. 

  • A toilet: a fixture used for urination and defecation. 

  • Any group of people. 

  • The penalty paid to the pool in lanterloo for breaking certain rules or failing to take a trick. 

  • A lieutenant. 

  • A game of lanterloo. 

verb
  • To urge on with cries of loo or (figuratively) by other shouting or outcry. 

  • To pay a penalty to the pool for breaking certain rules or failing to take a trick in lanterloo. 

  • To beat in the card game lanterloo. 

  • To pay any penalty to any community. 

intj
  • A cry to urge on hunting dogs. 

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