gravity vs substance

gravity

noun
  • The state or condition of being grave; seriousness. 

  • The lowness of a note. 

  • Specific gravity. 

  • The state or condition of having weight; weight; heaviness. 

  • Gravitation, the universal force exercised by two bodies onto each other. 

  • The force at the Earth's surface, of the attraction by the Earth's masses, and the centrifugal pseudo-force caused by the Earth's rotation, resulting from gravitation. 

substance

noun
  • Substantiality; solidity; firmness. 

  • Physical matter; material. 

  • Material possessions; estate; property; resources. 

  • Hypostasis. 

  • Drugs (illegal narcotics) 

  • The essential part of anything; the most vital part. 

  • A form of matter that has constant chemical composition and characteristic properties. 

verb
  • To give substance to; to make real or substantial. 

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