jigsaw vs scarify

jigsaw

verb
  • To cut something using a jigsaw. 

noun
  • Something that can be compared to a jigsaw puzzle. 

  • A power saw with fine teeth and a narrow blade which can cut curves in wood or metal. 

  • A jigsaw puzzle. 

scarify

verb
  • To make scratches or cuts on. 

  • 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. 

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