bath vs inner tube

bath

noun
  • The act of bathing. 

  • A substance or preparation in which something is immersed. 

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

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

  • A building or area where bathing occurs. 

  • The body of liquid one bathes in. 

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

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

inner tube

noun
  • Synonym of swim ring 

  • An inflatable rubber tube inserted into the casing of a pneumatic tyre/tire. 

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