roughness vs symmetry

roughness

noun
  • A measure of how rough something is, such as a surface 

  • Abundance, especially of food. 

  • Roughage; coarse fodder. 

  • The property of being rough, coarseness. 

  • Something that is rough; a rough spot. 

symmetry

noun
  • Exact correspondence on either side of a dividing line, plane, center or axis. 

  • The satisfying arrangement of a balanced distribution of the elements of a whole. 

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