hardness vs material

hardness

noun
  • The quality of being hard. 

  • An instance of this quality; hardship. 

  • The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material. 

  • The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation. 

  • The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack. 

  • A measure of how hard a material is 

  • The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm). 

material

noun
  • All of a player's pieces and pawns on the chessboard. 

  • Related data of various kinds, especially if collected as the basis for a document or book. 

  • The substance that something is made or composed of. 

  • Matter which may be shaped or manipulated, particularly in making something. 

  • Text written for a specific purpose. 

  • A sample or specimens for study. 

  • Cloth to be made into a garment. Fabric. 

  • An element of a design language associated with a certain style of rendering on the display. 

  • A person, or people collectively, who are qualified for a certain position or activity. 

adj
  • Significant. 

  • Having to do with matter; consisting of matter. 

  • Worldly, as opposed to spiritual. 

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