canoe vs lifeboat

canoe

noun
  • A small long and narrow boat, propelled by one or more people (depending on the size of canoe), using single-bladed paddles. The paddlers face in the direction of travel, in either a seated position, or kneeling on the bottom of the boat. Canoes are open on top, and pointed at both ends. 

  • An oversize, usually older, luxury car. 

  • Any of the deflectors positioned around a roulette wheel, shaped like upside-down boats. 

verb
  • To ride or paddle a canoe. 

lifeboat

noun
  • A boat especially designed for saving the lives of shipwrecked people or people in distress at sea (either launched from the shore with a crew, or else carried on board a larger ship). 

  • An emergency vehicle carried aboard a spaceship. 

verb
  • To rescue; to carry to safety 

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