conceal vs rumble

conceal

verb
  • To hide something from view or from public knowledge, to try to keep something secret. 

rumble

verb
  • To discover deceitful or underhanded behaviour. 

  • To move while making a rumbling noise. 

  • To make a low, heavy, continuous sound. 

  • To fight; to brawl. 

  • to provide haptic feedback by vibrating. 

  • To cause to pass through a rumble, or polishing machine. 

intj
  • An onomatopoeia describing a rumbling noise 

noun
  • A street fight or brawl. 

  • A rotating cask or box in which small articles are smoothed or polished by friction against each other. 

  • A low, heavy, continuous sound, such as that of thunder or a hungry stomach. 

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