boozer vs bowser

boozer

noun
  • A vehicle equipped with tanks for supplying water to remote locations. 

  • One who drinks habitually; a drunkard. 

  • A public house, pub. 

bowser

noun
  • A mobile water tank deployed to distribute fresh water in emergency situations where the normal system of piped distribution has broken down or is insufficient. 

  • A buffoon or imbecile. 

  • A road vehicle (often a trailer) for the transport of liquid fuel, particularly aviation fuel at an airfield. 

  • A fuel metering/delivery pump at a filling station. 

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