kickback vs repercussion

kickback

noun
  • A backward kick, a retrograde movement of an extremity. 

  • recoil; a sudden backward motion, usually in the direction of the operator. 

  • An accident wherein the upper tip of the bar of a running chainsaw contacts a relatively immovable object, forcing the bar upwards and pressing the running chain more firmly against the object, causing the saw to be hurled upwards and backwards into the operator's face. 

  • A dangerous buildup of gas pressure at the wellhead. 

  • In contract bridge, an ace asking convention initiated by the first step above four of the agreed trump suit. 

  • An accident where an object being cut by a rotating blade or disk, such as a circular saw, is caught by the blade and thrown outward. 

  • The board separating one bowling lane from another at the pit end. 

  • A feature that saves the ball from draining and propels it back into play. 

  • A relaxed party. 

  • A covert, often illegal, payment in return for a favor consisting of providing an opportunity of chargeable transaction; a kind of bribe. 

repercussion

noun
  • The act of driving back, or the state of being driven back; reflection; reverberation. 

  • In a vaginal examination, the act of imparting through the uterine wall with the finger a shock to the foetus, so that it bounds upward, and falls back again against the examining finger. 

  • The subsidence of a tumour or eruption by the action of a repellent. 

  • A consequence or ensuing result of some action. 

  • Rapid reiteration of the same sound. 

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