life raft vs speedboat

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. 

speedboat

noun
  • A boat used for waterskiing. 

  • A fast boat, usually small (for 1-8 people). 

  • A boat designed and built for racing. 

verb
  • To travel by speedboat. 

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