colter vs incision

colter

noun
  • A knife or cutter attached to the beam of a plow to cut the sward, in advance of the plowshare and moldboard. 

  • The part of a seed drill that makes the furrow for the seed. 

incision

noun
  • The act of cutting into a substance. 

  • A cut-back 

  • A cut, especially one made by a scalpel or similar medical tool in the context of surgical operation; the scar resulting from such a cut. 

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