hypocoristic vs street name

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. 

street name

noun
  • A person’s nickname, such as a gangster or mafia name. 

  • The slang term for a drug, as traded on the streets. 

  • Used other than figuratively or idiomatically: see street, name. 

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