aid vs backing

aid

noun
  • The rider's use of hands, legs, voice, etc. to control the horse. 

  • Help; assistance; succor, relief. 

  • An historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort. 

  • A helper; an assistant. 

  • An exchequer loan. 

  • Something which helps; a material source of help. 

  • A pecuniary tribute paid by a vassal to his feudal lord on special occasions. 

verb
  • To climb with the use of aids such as pitons. 

  • To provide support to; to further the progress of; to help; to assist. 

backing

noun
  • The mounting of a horse or other animal. 

  • Support, especially financial. 

  • A backdrop. 

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

  • A liner or other material added behind or underneath. 

  • Musicians and vocalists who support the main performer. 

adj
  • Providing support for the main performer. 

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