baritone vs rumbling

baritone

noun
  • The male voice between tenor and bass 

  • a brass instrument similar to the euphonium, but with a cylindrical bore instead of a conical one; a baritone saxhorn 

  • The musical range between tenor and bass 

  • A person, instrument, or group that performs in the range between tenor and bass 

rumbling

noun
  • A deep low noise. 

  • A muted sound of complaint or discontent. 

adj
  • Deep- and slow-sounding. 

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