accumulation vs snowballing

accumulation

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

  • A mass of something piled up or collected. 

  • 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. 

snowballing

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