apprentice vs rookie

apprentice

noun
  • A trainee, especially in a skilled trade. 

  • One who is bound by indentures or by legal agreement to serve a tradesperson, or other person, for a certain time, with a view to learn the art, or trade, in which his master is bound to instruct him. 

verb
  • To put under the care and supervision of a master, for the purpose of instruction in a trade or business. 

  • To be an apprentice to. 

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 apprentice and rookie occurred in a corpus of books? (source: Google Ngram Viewer )