panning vs tremble

panning

noun
  • The act by which a sound is panned. 

  • Material that has been panned. 

  • Thorough criticism. 

  • The act of one who pans, as for gold. 

tremble

noun
  • A shake, quiver, or vibration. 

verb
  • To shake, quiver, or vibrate. 

  • To fear; to be afraid. 

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