crepitate vs rustle

crepitate

verb
  • to crackle, as crepitant lungs do, as some arthritic joints may do, or as some fractured bones may do. 

rustle

verb
  • To move (something) with a soft crackling sound. 

  • To make or obtain in a lively, energetic way. 

  • To steal (cattle or other livestock). 

noun
  • A soft crackling sound similar to the movement of dry leaves. 

  • A movement producing such a sound. 

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