endearment vs puppy love

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. 

puppy love

noun
  • A childish or youthful infatuation with another person. 

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