gnaw vs munch

gnaw

verb
  • To bite something persistently, especially something tough. 

  • To produce excessive anxiety or worry. 

  • To corrode; to fret away; to waste. 

noun
  • the act of gnawing 

munch

verb
  • To chew with a grinding, crunching sound, and with the mouth closed. 

  • To eat vigorously or with excitement. 

noun
  • Someone who easily agrees to give oral sex. 

  • A location or restaurant where good eating can be expected. 

  • A casual meeting for those interested in BDSM, usually at a restaurant. 

  • An act of eating. 

  • Food. 

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