whelp vs yearling

whelp

noun
  • A young offspring of a canid (ursid, felid, pinniped), especially of a dog or a wolf, the young of a bear or similar mammal (lion, tiger, seal); a pup, wolf cub. 

  • One of several wooden strips to prevent wear on a windlass on a clipper-era ship. 

  • An insolent youth; a mere child. 

  • A tooth on a sprocket wheel (compare sprocket and cog). 

verb
  • To give birth. 

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 whelp and yearling occurred in a corpus of books? (source: Google Ngram Viewer )