drawback vs reward

drawback

noun
  • A disadvantage; something that detracts or takes away. 

  • The inhalation of a lungful of smoke from a cigarette. 

  • A partial refund of an import fee, as when goods are re-exported from the country that collected the fee. 

reward

noun
  • The result of an action, whether good or bad. 

  • Something of value given in return for an act. 

  • A prize promised for a certain deed or catch 

verb
  • To give a reward to or for. 

  • To recompense. 

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