hubble-bubble vs water pipe

hubble-bubble

noun
  • A hookah. 

  • A bubbling sound. 

water pipe

noun
  • A device for smoking, such as a hookah or bong, in which the smoke is drawn through a container of water before inhaling. 

  • A pipe that is a conduit for water; an essential element of plumbing. 

How often have the words hubble-bubble and water pipe occurred in a corpus of books? (source: Google Ngram Viewer )