pilot burner vs soar

pilot burner

noun
  • Synonym of pilot light (“persistent flame to ignite gas”) 

soar

noun
  • The act of soaring. 

  • An upward flight. 

verb
  • To rise, especially rapidly or unusually high. 

  • To mount upward on wings, or as on wings, especially by gliding while employing rising air currents. 

  • To rise in thought, spirits, or imagination; to be exalted in mood. 

  • To remain aloft by means of a glider or other unpowered aircraft. 

  • To fly high with little effort, like a bird. 

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