scarify vs scourge

scarify

verb
  • To harrow the feelings. 

  • To remove thatch (build-up of organic matter on the soil) from a lawn, to dethatch. 

  • To break up, loosen, or roughen the surface of a field or road or a hard surface. 

  • To scratch, etch, burn, or cut designs into one's skin as a form of body modification. 

  • To damage the testa (seed coat) of a seed by cutting, scraping, chemicals, hot water, or fire to allow permeation of water and faster germination. 

  • To make scratches or cuts on. 

scourge

verb
  • To strike with a scourge; to flog. 

noun
  • A source of persistent trouble such as pestilence that causes pain and suffering or widespread destruction. 

  • A whip, often of leather and often multi-tailed. 

  • A means to inflict such pain or destruction. 

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