CPU vs processor

CPU

noun
  • The main computer case containing the central components of a personal computer. 

  • Any character or entity controlled by the game software. 

processor

noun
  • A central processing unit. 

  • A device which processes, which changes something (a computer processor, food processor, etc.). 

  • A microprocessor. 

  • A person or institution who processes things (foods, photos, applications, etc.). 

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