dinghy vs life raft

dinghy

noun
  • An inflatable rubber life raft. 

  • A sailing dinghy. 

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

verb
  • To travel by dinghy. 

life raft

noun
  • A usually inflatable raft carried aboard a ship or airplane, used to save lives in case the vessel has to be abandoned in an emergency on the sea. 

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