début vs occur

début

verb
  • To make one's début. 

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

occur

verb
  • To happen or take place. 

  • To present or offer itself. 

  • To be present or found. 

  • To come or be presented to the mind; to suggest itself. 

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