paddlewheel vs sculler

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. 

sculler

noun
  • A boat rowed by one person with two sculls, or short oars. 

  • One who sculls; an athlete who participates in sculling races. 

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