bathhouse vs steam room

bathhouse

noun
  • A building with baths for communal use. 

  • A building where swimmers can change clothes. 

  • A business with bath-like facilities, which chiefly serves as a place for sexual encounters, especially among men. 

steam room

noun
  • A sauna; a hot room that is filled with steam in which people sit for health reasons. 

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