chef's knife vs cleaver

chef's knife

noun
  • A type of general purpose kitchen knife used for food preparation, typically measuring eight inches by one and a half inches. 

cleaver

noun
  • A squarish, heavy knife used by butchers for hacking through bones, etc. 

  • A type of clave, or rhythm stick, a concussive musical instrument used in traditional Bahamian music. 

  • The act of eliminating someone or something, especially when done by someone with a history of other eliminations; a dismissal, rejection, or removal. 

How often have the words chef's knife and cleaver occurred in a corpus of books? (source: Google Ngram Viewer )