lavage vs powder room

lavage

noun
  • A washing. 

  • A washing of a hollow organ. 

verb
  • To wash a hollow organ 

powder room

noun
  • Synonym of half bath: a small room with a toilet and sink but no bathtub or shower. 

  • Synonym of ladies' room: a lavatory intended for use by women. 

  • A room used to powder hair and wigs. 

  • A room used to store gunpowder, particularly (historical) on a ship equipped with cannon. 

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