drain vs drainpipe

drain

noun
  • An access point or conduit for rainwater that drains directly downstream in a (drainage) basin without going through sewers or water treatment in order to prevent or belay floods. 

  • Something consuming resources and providing nothing in return. 

  • One terminal of a field effect transistor (FET). 

  • An outhole. 

  • A conduit allowing liquid to flow out of an otherwise contained volume; a plughole (UK) 

  • An act of urination. 

verb
  • To flow gradually. 

  • To draw off by degrees; to cause to flow gradually out or off; hence, to exhaust. 

  • To deplete of energy or resources. 

  • To convert a perennially wet place into a dry one. 

  • To fall off the bottom of the playfield. 

  • To cause liquid to flow out of. 

  • To lose liquid. 

drainpipe

noun
  • A conduit for carrying rainwater or flood water. 

  • 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. 

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