purgation vs sprinkling

purgation

noun
  • The process or act of purging, such as by the use of a purgative. 

  • The process or act of cleansing from sin or guilt. 

sprinkling

noun
  • The action of the verb to sprinkle. 

  • A light shower of rain. 

  • A small thinly distributed amount, e.g. of some liquid, powder or other fine substance that is sprinkled on to something. 

  • A scattering. 

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