kayak vs paddlewheel

kayak

noun
  • A type of small boat, covered over by a surface deck, powered by the occupant or occupants using a double-bladed paddle in a sitting position, from a hole in the surface deck 

verb
  • To use a kayak, to travel or race in a kayak. 

  • To traverse (a body of water) by kayak. 

paddlewheel

noun
  • A boat propelled by a paddlewheel. 

  • A large wheel fitted with thick slats, turned by an engine and used to propel a boat. 

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