kibble vs swarf

kibble

verb
  • To grind coarsely. 

noun
  • An iron bucket used in mines for hoisting anything to the surface. 

  • In the Transformers fandom, pieces of a toy or figure necessary for one mode, but appearing out of place or unnecessary in the other. 

  • Something that has been kibbled, especially grain for use as animal feed. 

  • Any artificial animal feed in pellet form. 

swarf

verb
  • To grind down. 

noun
  • The waste chips or shavings from an abrasive activity, such as metalworking, a saw cutting wood, or the use of a grindstone or whetstone. 

  • A particular waste chip or shaving. 

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