fuel vs ignite

fuel

verb
  • To provide with fuel. 

  • To exacerbate, to cause to grow or become greater. 

noun
  • Substance that provides nourishment for a living organism; food. 

  • Substance consumed to provide energy through combustion, or through chemical or nuclear reaction. 

  • Something that stimulates, encourages or maintains an action. 

ignite

verb
  • to commence burning. 

  • to spark off (something), to trigger 

  • to set fire to (something), to light (something) 

  • To subject to the action of intense heat; to heat strongly; often said of incombustible or infusible substances. 

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