rounder vs switcher

rounder

noun
  • One who rounds; one who comes about frequently or regularly. 

  • A person who makes the rounds of bars, saloons, and similar establishments; figuratively, a debaucher or roué 

  • A railroad man who worked at a roundhouse, operating the turntable. 

  • A fight lasting a specified number of rounds. 

  • A Methodist preacher traveling a circuit, also referred to as a circuit rider. 

  • A tool for making an edge or surface round. 

  • A person who earns a living by playing cards 

  • A sports league draft selection in a specified round or the player drafted with that selection. 

switcher

noun
  • One who or that which operates a switch. 

  • A switchmode power supply. 

  • Synonym of vision mixer (“device for selecting between video sources”) 

  • A railway locomotive used for shunting; a shunter. 

  • One who or that which switches, or changes to something else. 

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