murmur vs rumble

murmur

noun
  • Any low, indistinct sound, like that of running water. 

  • The sound made by any condition which produces noisy, or turbulent, flow of blood through the heart. 

  • A muttered complaint or protest; the expression of dissatisfaction in a low muttering voice; any expression of complaint or discontent. 

  • Soft indistinct speech. 

verb
  • To say (something) indistinctly, to mutter. 

  • To speak or make low, indistinguishable noise; to mumble, mutter. 

rumble

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

  • A street fight or brawl. 

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

verb
  • 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. 

  • To discover deceitful or underhanded behaviour. 

intj
  • An onomatopoeia describing a rumbling noise 

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