pup vs yearling

pup

noun
  • Any cute dog, regardless of age. 

  • A young, inexperienced person. 

  • A young dog, wolf, fox, seal, bat or shark, or the young of certain other animals. 

  • A short semi-trailer used jointly with a dolly and another semi-trailer to create a twin trailer. 

  • A new plant growing from a shoot that can be used for propagation. 

  • An early edition of a periodical publication, intended for distribution to distant locations. 

  • A kind of small spotlight. 

verb
  • To give birth to pups. 

yearling

noun
  • An animal that is between one and two years old; one that is in its second year (but not yet two full years old). 

  • A racehorse that is considered to be one year old until a subsequent January 1st. 

  • A sophomore at West Point military academy. 

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