bath vs flutterboard

bath

noun
  • The body of liquid one bathes in. 

  • A substance or preparation in which something is immersed. 

  • A tub or pool which is used for bathing: bathtub. 

  • The act of bathing. 

  • A former Hebrew unit of liquid volume (about 23 L or 6 gallons). 

  • A building or area where bathing occurs. 

verb
  • To wash a person or animal in a bath. 

  • To bathe (oneself); to have a bath. 

flutterboard

noun
  • A buoyancy board made of foam, used to support the body when in water. 

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