incendiary vs pilot light

incendiary

noun
  • Something capable of causing fire, particularly a weapon. 

  • One who excites or inflames factions into quarrels. 

  • One who maliciously sets fires. 

adj
  • Intentionally stirring up strife, riot, rebellion. 

  • Capable of, or used for, or actually causing fire. 

  • Inflammatory, emotionally charged. 

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 incendiary and pilot light occurred in a corpus of books? (source: Google Ngram Viewer )