début vs ken

début

noun
  • A person’s or thing’s first appearance before society or another audience; one’s “maiden voyage”. 

verb
  • To make one's début. 

ken

noun
  • Knowledge, perception, or sight. 

  • Youth or children's group. 

  • A Japanese unit of length equal to six shakus 

  • Range of sight. 

  • The tsurugi 

verb
  • To know, perceive or understand. 

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