realize vs seize upon

realize

verb
  • To acquire as an actual possession; to obtain as the result of plans and efforts; to gain; to get 

  • To become aware of (a fact or situation, especially of something that has been true for a long time). 

  • To cause to seem real to other people. 

  • To turn an abstract linguistic object into actual language, especially said of a phoneme's conversion into speech sound. 

  • To make real; to convert from the imaginary or fictitious into reality; to bring into real existence 

  • To convert any kind of property into money, especially property representing investments, such as shares, bonds, etc. 

  • To sense vividly or strongly; to make one's own in thought or experience. 

seize upon

verb
  • To take possession of or claim (an idea, person, event, etc.) as one's own; to assimilate, absorb, annex, co-opt. 

  • To take up, embrace, enact, or turn eagerly to (a plan, idea, ideology, cause, practice, method, etc.); to grasp, understand, and accept quickly; to adopt wholeheartedly or vigorously. 

  • To grasp or take hold of (an object) suddenly, forcibly, or tightly. 

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