kerf vs penetration

kerf

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

  • 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. 

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

penetration

noun
  • The act of penetrating something. 

  • Specifically, the insertion of the penis (or similar object) during sexual intercourse. 

  • The act of penetrating a given situation with the mind or faculties; perception, discernment. 

  • A number or fraction that represents how many cards/decks will be dealt before shuffling, in contrast to the total number of cards/decks in play. 

  • The proportion of the target audience who buy the advertised product or service. 

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