hypocoristic vs nickname

hypocoristic

noun
  • A nickname, especially one indicating intimacy and formed through a shortening of the original name. 

adj
  • Relating to a nickname, usually indicating intimacy with the person. 

  • Relating to baby talk. 

nickname

noun
  • A familiar, shortened or diminutive name for a person or thing. 

  • A familiar, invented name for a person or thing used instead of the actual name of the person or thing, often based on some noteworthy characteristic. 

verb
  • To give a nickname to (a person or thing). 

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