powerhouse vs rookie

powerhouse

noun
  • A very good hand of cards, likely to win. 

  • A power station; the building housing a power station 

  • Any source of power, energy or strength; a source of influence or inspiration 

rookie

adj
  • non-professional; amateur 

noun
  • 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. 

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

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