concentration vs diligence

concentration

noun
  • The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water. 

  • The proportion of a substance in a whole. 

  • The act, process or product of reducing the volume of a liquid, as by evaporation. 

  • The direction of attention to a specific object. 

  • A field or course of study on which one focuses, especially as a student in a college or university. 

  • The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm)) 

  • The matching game pelmanism. 

diligence

noun
  • The process by which persons, lands, or effects are seized for debt; process for enforcing the attendance of witnesses or the production of writings. 

  • A public stage-coach. 

  • Steady application; industry; careful work involving long-term effort. 

  • The qualities of a hard worker, including conscientiousness, determination, and perseverance. 

  • Carefulness. 

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