center field vs fullback

center field

noun
  • The defensive position in the outfield in the middle, typically played by a player that can run fast. 

  • The part of a baseball field which is beyond the infield and straight ahead left if you stand on home plate and face the pitcher. 

  • A central role in some activity that requires speed. 

fullback

noun
  • A player who plays on the left or right side of defence. 

  • A position behind the main line of backs in both rugby union and rugby league. In rugby union, they wear number 15 jersey at the start of play and are the last line of defence responsible for catching punts. 

  • A defensive player who assists the goalie in preventing the opposing team from scoring. 

  • An offensive back whose primary jobs are to block in advance of the halfback on running plays and for the quarterback on passing plays. 

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