sheen vs shininess

sheen

noun
  • Splendor; radiance; shininess. 

  • A thin layer of a substance (such as oil) spread on a solid or liquid surface. 

  • The letter ش in the Arabic script. 

adj
  • Beautiful, good-looking, attractive; radiant; shiny. 

verb
  • To shine; to glisten. 

shininess

noun
  • The visual property of something shining with reflective light; shine. 

  • The coefficient of specular reflectivity associated with the surface of an object being displayed. 

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