backing vs impediment

backing

noun
  • The action of putting something back; a switching into reverse. 

  • Support, especially financial. 

  • A backdrop. 

  • The mounting of a horse or other animal. 

  • A liner or other material added behind or underneath. 

  • Musicians and vocalists who support the main performer. 

adj
  • Providing support for the main performer. 

impediment

noun
  • A hindrance; that which impedes or obstructs progress. 

  • Baggage, especially that of an army; impedimenta. 

  • A disability, especially one affecting the hearing or speech. 

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