ablutions vs sauna

ablutions

noun
  • A building that houses bathing and toilet facilities on a military base. 

  • The location or building where the showers and basins are located. 

sauna

noun
  • A public sauna. 

  • A very hot place or room. 

  • A room or a house designed for heat sessions. 

  • The act of using a sauna. 

  • In some countries, a business with bath-like facilities that is actually a brothel or a place for (non-commercial) sexual encounters; a bathhouse. 

verb
  • To use a sauna. 

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