cecity vs ken

cecity

noun
  • blindness 

ken

verb
  • To know, perceive or understand. 

noun
  • Youth or children's group. 

  • A Japanese unit of length equal to six shakus 

  • Range of sight. 

  • Knowledge, perception, or sight. 

  • The tsurugi 

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