illustration vs image

illustration

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

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

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

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

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

image

noun
  • An optical or other representation of a real object; a graphic; a picture. 

  • A statue or idol. 

  • What a function maps to. 

  • A file that contains all information needed to produce a live working copy. (See disk image and image copy.) 

  • A form of interference: a weaker "copy" of a strong signal that occurs at a different frequency. 

  • The subset of a codomain comprising those elements that are images of something. 

  • A mental picture of something not real or not present. 

  • A characteristic of a person, group or company etc., style, manner of dress, how one is or wishes to be perceived by others. 

verb
  • To create an image of. 

  • To create a complete backup copy of a file system or other entity. 

  • To represent by an image or symbol; to portray. 

  • To reflect, mirror. 

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