purging vs sublation

purging

noun
  • A removal of undesirable people. 

  • Vomiting; vomiting induced by purgatives. 

  • The cleansing of a device by flushing it with water, steam, or some other liquid or gas. 

  • The removal of excess humors through bloodletting, induced vomitting, etc. 

  • The removal of digested waste: defecation; defecation induced by laxatives. 

sublation

noun
  • Removal, taking away. 

  • A flotation method in which the material to be separated is adsorbed on the surface of gas bubbles in a liquid and is collected on an upper layer of an immiscible liquid 

  • In Hegelian philosophy, the situation where a thesis and antithesis interact. 

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