launch vs life raft

launch

noun
  • An open boat of any size powered by steam, petrol, electricity, etc. 

  • The act or fact of launching (a ship/vessel, a project, a new book, etc.). 

  • A boat used to convey guests to and from a yacht. 

  • The boat of the largest size and/or of most importance belonging to a ship of war, and often called the "captain's boat" or "captain's launch". 

  • The movement of a vessel from land into the water; especially, the sliding on ways from the stocks on which it is built. (Compare: to splash a ship.) 

  • An event held to celebrate the launch of a ship/vessel, project, a new book, etc.; a launch party. 

verb
  • To cause (a vessel) to move or slide from the land or a larger vessel into the water; to set afloat. 

  • To cause (a rocket, balloon, etc., or the payload thereof) to begin its flight upward from the ground. 

  • To throw (a projectile such as a lance, dart or ball); to hurl; to propel with force. 

  • Of a ship, rocket, balloon, etc.: to depart on a voyage; to take off. 

  • To send out; to start (someone) on a mission or project; to give a start to (something); to put in operation 

  • To start to operate. 

  • To move with force and swiftness like a sliding from the stocks into the water; to plunge; to begin. 

  • To release; to put onto the market for sale 

  • To start (a program or feature); to execute or bring into operation. 

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 launch and life raft occurred in a corpus of books? (source: Google Ngram Viewer )