kerf vs whittle

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. 

whittle

verb
  • To cut or shape wood with a knife. 

  • To reduce or gradually eliminate something (such as a debt). 

  • To make eager or excited; to excite with liquor; to inebriate. 

noun
  • A knife; especially, a pocket knife, sheath knife, or clasp knife. 

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