sett vs trepan

sett

noun
  • A small, square-cut piece of quarried stone used for paving and edging. 

  • The pattern of distinctive threads and yarns that make up the plaid of a Scottish tartan. 

  • The number of warp ends per inch in the cloth. 

  • The system of tunnels that is the home of a badger. 

  • The number of reeds or splits per inch – one half the number of ends per inch. 

trepan

noun
  • A tool used to bore through rock when sinking shafts. 

  • A surgical instrument used to remove a circular section of bone from the skull; a trephine. 

verb
  • To create a large hole by making a narrow groove outlining the shape of the hole and then removing the plug of material remaining by less expensive means. 

  • To use a trepan; to trephine. 

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