balancer vs rein

balancer

noun
  • One who, or that which, balances. 

  • An acrobat. 

  • Any of the rear wings of certain insects used for stability in flight. 

rein

noun
  • An instrument or means of curbing, restraining, or governing. 

  • A strap or rope attached to a bridle or bit, used to control a horse, animal or young child. 

  • The inward impulses; the affections and passions, formerly supposed to be located in the area of the kidneys. 

verb
  • To restrain; to control; to check. 

  • To obey directions given with the reins. 

  • To direct or stop a horse by using reins. 

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