boozer vs water tender

boozer

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

  • One who drinks habitually; a drunkard. 

  • A public house, pub. 

water tender

noun
  • A specialized firefighting apparatus designed for transporting water from a water source, such as a lake or hydrant, to a fire scene. 

  • A first-class petty officer in charge in a fireroom, who supplies the boilers with water, sees that fires are properly cleaned and stoked, etc. 

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