cautioning vs thunder

cautioning

noun
  • The act of giving a warning. 

thunder

noun
  • An alarming or startling threat or denunciation. 

  • The spotlight. 

  • The loud rumbling, cracking, or crashing sound caused by expansion of rapidly heated air around a lightning bolt. 

  • A deep, rumbling noise resembling thunder. 

verb
  • To say (something) with a loud, threatening voice. 

  • To make a noise like thunder. 

  • To produce thunder; to sound, rattle, or roar, as a discharge of atmospheric electricity. 

  • To (make something) move very fast (with loud noise). 

  • To produce something with incredible power. 

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