header vs rollover

header

noun
  • The act of hitting the ball with the head. 

  • A headlong fall, jump or dive. 

  • Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it. 

  • A pipe which connects several smaller pipes. 

  • One who puts a head on something. 

  • Text, or other visual information, that goes at the top of a column of information in a table. 

  • A font, text style, or typesetting used for any of the above. 

  • Someone who heads the ball. 

  • A raised tank that supplies water at constant pressure, especially to a central heating and hot water system. 

  • The upper portion of a page (or other) layout. 

  • The first part of a file or record that describes its contents. 

  • A machine that separates and gathers the heads of grain etc. 

  • the first part of a packet or stream, often containing its address and descriptors. 

  • A horizontal structural or finish piece over an opening. 

  • The rodeo performer who drives the steer toward the heeler to be tied. 

  • A brick that is laid sideways at the top of a wall or within the brickwork with the short side showing. 

verb
  • To strike (a ball) with one's head. 

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 header and rollover occurred in a corpus of books? (source: Google Ngram Viewer )