dinghy vs flatboat

dinghy

noun
  • A small open boat, propelled by oars or paddles, carried as a tender, lifeboat, or pleasure craft on a ship. 

  • An inflatable rubber life raft. 

  • A sailing dinghy. 

verb
  • To travel by dinghy. 

flatboat

noun
  • A boxy, flat-bottomed boat used for carrying livestock, freight, and people on rivers. 

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