perk vs reward

perk

verb
  • To make trim or smart; to straighten up; to erect; to make a jaunty or saucy display of. 

  • Of coffee: to be produced by heated water seeping (“percolating”) through coffee grounds. 

  • To appear from below or behind something, emerge, pop up, poke out. 

  • To make (coffee) in a percolator or a drip coffeemaker. 

noun
  • Perquisite. 

  • A percolator, particularly of coffee. 

  • A bonus ability that a player character can acquire; a permanent power-up. 

reward

verb
  • To give a reward to or for. 

  • To recompense. 

noun
  • Something of value given in return for an act. 

  • A prize promised for a certain deed or catch 

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

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