drainpipe vs fistula

drainpipe

noun
  • The type of pipe that is used to construct a drainpipe. 

  • A pipe that carries wastewater from a bathtub, shower, sink, etc. 

  • A pipe that is part of a device or appliance for carrying away waste fluid. 

  • A type of form-fitting trousers with highly tapered legs. 

  • A verticle pipe carrying water from the roof gutter down the side of a building; downspout. 

  • A conduit for carrying rainwater or flood water. 

fistula

noun
  • A tube, a pipe, or a hole. 

  • An abnormal connection or passageway between organs or vessels that normally do not connect. 

  • The tube through which the wine of the Eucharist was once sucked from the chalice in certain ceremonies (such as papal Masses). 

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