firestarter vs pilot light

firestarter

noun
  • A tool used to start a fire. 

  • One who starts fires. 

pilot light

noun
  • A small, persistent flame used to ignite gas. 

  • A small telltale lamp on a dynamo or battery circuit whose brightness indicates the voltage of the current. 

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