cub vs fledgling

cub

noun
  • A child, especially an awkward, rude, ill-mannered boy. 

  • A young man who seeks relationships with older women, or "cougars". 

  • A young fox. 

  • Synonym of cub reporter 

  • An adolescent furry character. 

  • The young of certain other animals, including the bear, wolf, lion and tiger. 

verb
  • To hunt fox cubs. 

  • To give birth to cubs. 

fledgling

noun
  • An immature, naïve or inexperienced person. 

  • A young bird which has just developed its flight feathers (notably wings). 

  • An insect that has just fledged, i.e. undergone its final moult to become an adult or imago. 

adj
  • Emergent or rising. 

  • Untried or inexperienced. 

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