drainpipe vs outflow

drainpipe

noun
  • 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. 

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

  • 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. 

outflow

noun
  • Something that flows out of a sewage treatment plant. 

  • Any outward movement. 

  • The process of flowing out. 

  • A fluid that flows out. 

  • A stream of gaseous material emanating from an active galactic nucleus. 

  • The part of a system that allows material to flow out. 

verb
  • To flow outward. 

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