kingpin vs muckamuck

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. 

muckamuck

noun
  • A person in a position of power or authority, or of high status. 

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