apprehend vs realize

apprehend

verb
  • To be or become aware of (something); to perceive. 

  • To have a conception of (something); to consider, to regard. 

  • To seize or take (something); to take hold of. 

  • To understand. 

  • To be of opinion, believe, or think; to suppose. 

  • To seize or take (a person) by legal process; to arrest. 

  • To be apprehensive; to fear. 

  • To anticipate (something, usually unpleasant); especially, to anticipate (something) with anxiety, dread, or fear; to dread, to fear. 

  • To acknowledge the existence of (something); to recognize. 

  • To take hold of (something) with understanding; to conceive (something) in the mind; to become cognizant of; to understand. 

realize

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

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

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

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