existence vs materialization

existence

noun
  • Empirical reality; the substance of the physical universe. (Dictionary of Philosophy; 1968) 

  • The state of being, existing, or occurring; beinghood. 

materialization

noun
  • The conversion of something into a physical form 

  • The creation of a temporary table containing the results of a database query. 

  • The conversion of energy into mass 

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