murmur vs screech

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. 

screech

noun
  • A high-pitched strident or piercing sound, such as that between a moving object and any surface. 

  • A form of home-made rye whiskey made from used oak rye barrels from a distillery. 

  • Newfoundland rum. 

  • A harsh, shrill cry, as of one in acute pain or in fright; a shriek; a scream. 

verb
  • To travel very fast, as if making the sounds of brakes being released. 

  • To make such a sound. 

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