roar vs thunder

roar

noun
  • A loud resounding noise. 

  • A show of strength or character. 

  • The deep cry of the bull. 

  • A long, loud, deep shout, as of rage or laughter, made with the mouth wide open. 

  • The cry of the lion. 

verb
  • Of animals (especially a lion), to make a loud deep noise. 

  • To make a loud noise in breathing, as horses do when they have a certain disease. 

  • To proceed vigorously. 

  • To be boisterous; to be disorderly. 

  • Generally, of inanimate objects etc., to make a loud resounding noise. 

  • To cry aloud; to proclaim loudly. 

  • To laugh in a particularly loud manner. 

  • To make a loud, deep cry, especially from pain, anger, or other strong emotion. 

  • to cry 

thunder

noun
  • A deep, rumbling noise resembling thunder. 

  • The spotlight. 

  • An alarming or startling threat or denunciation. 

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

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 roar and thunder occurred in a corpus of books? (source: Google Ngram Viewer )