racket vs rollover

racket

noun
  • An implement with a handle connected to a round frame strung with wire, sinew, or plastic cords, and used to hit a ball, such as in tennis or a birdie in badminton. 

  • An illegal scheme for profit; a fraud or swindle; or both coinstantiated. 

  • A broad wooden shoe or patten for a man or horse, to allow walking on marshy or soft ground. 

  • A loud noise. 

  • A snowshoe formed of cords stretched across a long and narrow frame of light wood. 

verb
  • To strike with, or as if with, a racket. 

  • To make a clattering noise. 

rollover

noun
  • A target on the pinball table that is activated when the ball rolls over it. 

  • A graphic element that changes its appearance when the cursor moves over it. 

  • A road traffic accident in which a vehicle overturns. 

  • In the National or European lottery, the situation in which a jackpot that has not been won is carried over to the next week. 

  • The reinvestment of funds in a new issue of the same or similar investment. 

  • The process of incrementing, especially back to an initial value. 

  • A keyboard feature where each key is scanned independently, so that multiple simultaneous keypresses always register correctly. 

  • A fee paid by a borrower in order to defer full repayment of a loan. 

  • The sudden ignition of flammable gasses (produced by pyrolysis in an oxygen-poor environment) near the ceiling of a room or other enclosed space. 

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