spile vs sprinkler head

spile

noun
  • A spigot or plug used to stop the hole in a barrel or cask. 

  • A pile; a post or girder. 

  • A spout inserted in a maple (or other tree) to draw off sap. 

verb
  • To provide (a barrel, tree etc.) with a spile. 

  • To support by means of spiles. 

  • spoil. 

  • To plug (a hole) with a spile. 

  • To draw off (a liquid) using a spile. 

  • To drive piles into. 

sprinkler head

noun
  • A heat-activated device that sprays water in the event of a fire, usually mounted on a ceiling. 

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