chaw vs serration

chaw

noun
  • A plug or wad of chewing tobacco. 

  • Chewing tobacco. 

verb
  • To steal. 

  • To chew; to grind with one's teeth; to masticate (food, or the cud) 

serration

noun
  • A set of teeth or notches. 

  • One of the teeth in a serrated or serrate edge. 

  • The state of being serrated. 

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