colt vs rookie

colt

noun
  • A youthful or inexperienced person; a novice. 

  • A short piece of rope once used by petty officers as an instrument of punishment. 

  • A young camel or donkey. 

  • A young male horse. 

  • A young crane (bird). 

  • A professional cricketer during his first season. 

verb
  • To frisk or frolic like a colt; to act licentiously or wantonly. 

rookie

noun
  • An inexperienced recruit, especially in the police or armed forces. 

  • A type of firecracker, used by farmers to scare rooks. 

  • A novice. 

  • An athlete either new to the sport or to a team or in his first year of professional competition, especially said of baseball, basketball, hockey and American football players. 

adj
  • non-professional; amateur 

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