lavabo vs women's room

lavabo

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

  • A trough used for washing at some medieval monasteries. 

  • The small towel used to dry the priest's hands following the ritual. 

  • A ritual involving the washing of one's hands at a church's offertory before handling the Eucharist. 

  • A washbasin, particularly (Christianity) the one in a church used in the ritual. 

women's room

noun
  • Synonym of ladies' room: a public lavatory intended for women. 

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

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