accumulation vs concentration

accumulation

noun
  • A mass of something piled up or collected. 

  • The act of amassing or gathering, as into a pile. 

  • The concurrence of several titles to the same proof. 

  • The action of investors buying an asset from other investors when the price of the asset is low. 

  • The continuous growth of capital by retention of interest or savings. 

  • The practice of taking two higher degrees simultaneously, to reduce the length of study. 

  • The process of growing into a heap or a large amount. 

concentration

noun
  • The proportion of a substance in a whole. 

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

  • 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 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. 

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