boat vs water tender

boat

noun
  • A craft used for transportation of goods, fishing, racing, recreational cruising, or military use on or in the water, propelled by oars or outboard motor or inboard motor or by wind. 

  • A full house. 

  • One of two possible conformations of cyclohexane rings (the other being chair), shaped roughly like a boat. 

  • A vehicle, utensil, or dish somewhat resembling a boat in shape. 

  • The refugee boats arriving in Australian waters, and by extension, refugees generally. 

verb
  • To travel by boat. 

  • To transport in a boat. 

  • To place in a boat. 

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 boat and water tender occurred in a corpus of books? (source: Google Ngram Viewer )