e.g. vs illustration

e.g.

noun
  • An example. 

adv
  • "for example" or "for the sake of an example": used to introduce an illustrative example or short list of examples. 

illustration

noun
  • Something which illustrates; a comparison or example intended to make clear or apprehensible, or to remove obscurity. 

  • A calculated prevision of insurance premiums and returns (life insurance) 

  • The state of being illustrated, or of being made clear and distinct. 

  • A picture designed to decorate a publication, or elucidate a literary work. 

  • The act of illustrating; the act of making clear and distinct; 

How often have the words e.g. and illustration occurred in a corpus of books? (source: Google Ngram Viewer )