furrow vs kerf

furrow

verb
  • To cut one or more grooves in (the ground, etc.). 

  • To wrinkle. 

  • To pull one's brows or eyebrows together due to concentration, worry, etc. 

noun
  • A trench cut in the soil, as when plowed in order to plant a crop. 

  • Any trench, channel, or groove, as in wood or metal. 

  • A deep wrinkle in the skin of the face, especially on the forehead. 

kerf

verb
  • To cut a piece of wood or other material with several kerfs to allow it to be bent. 

noun
  • The portion or quantity (e.g. of wood, hay, turf, wool, etc.) removed or cut off in a given stroke. 

  • The distance between diverging saw teeth. 

  • The flattened, cut-off end of a branch or tree; a stump or sawn-off cross-section. 

  • The groove or slit created by cutting or sawing something; an incision. 

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