combination vs equalization

combination

noun
  • The act of combining, the state of being combined or the result of combining. 

  • One or more elements selected from a set without regard to the order of selection. 

  • An association or alliance of people for some common purpose. 

  • A combination shot; a billiard; a shot where the cue ball hits a ball that strikes another ball on the table. 

  • A sequence of numbers or letters used to open a combination lock. 

  • A rapid sequence of punches or strikes in boxing or other combat sports. 

  • A motorcycle and sidecar. 

  • An object formed by combining. 

equalization

noun
  • The act of equalizing, or state of being equalized. 

  • Repayment to an investor in a unit trust or OEIC of an increase in the unit price to cover the seller’s entitlement to income received from the underlying investments but not yet distributed to unit holders, repaid as part of the first distribution of income to that investor. 

  • Maneuvers to balance the pressure in the middle ear with the outside pressure by letting air enter along the Eustachian tubes. 

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