heavy hitter vs kingpin

heavy hitter

noun
  • A person of considerable importance who is a major decision maker or capable achiever; an especially significant organization or an especially functional object. 

  • A player with a favorable batting average who is especially good at hitting the ball deep into the outfield or farther. 

  • In any sport, a strong, physical player who is particularly effective. 

kingpin

noun
  • The most important person in an undertaking or organization. 

  • The axis around which steered wheels pivot; a bolt that holds the axis in place—a kingbolt. 

  • The bolt holding together the truck of a roller skate or skateboard. 

  • The pivot or connector between a tractor and trailer in the fifth-wheel coupling of semi-trailer truck. 

  • The pin at the centre of the triangle of bowling pins (originally the tallest pin in kayles). Sometimes also the headpin at the apex. 

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