endearment vs hypocoristic

endearment

noun
  • An expression of affection. 

  • The state or characteristic of being endeared. 

  • The act or process of endearing, of causing (something or someone) to be loved or to be the object of affection. 

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. 

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