keyhole vs notch

keyhole

noun
  • A circle cut out of a garment as a decorative effect, typically at the front or back neckline of a dress. 

  • A mortise for a key or cotter. 

  • A gravitational keyhole. 

  • Any small opening resembling the hole for a key in shape or function. 

  • A hole or excavation in beams intended to be joined together, to receive the key that fastens them. 

  • A transient column of vapor or plasma formed when using high energy beams, such as lasers, for welding or cutting. 

  • The free-throw lane together with the circle surrounding the free-throw line; key. 

  • The hole in a lock where the key is inserted and turns. 

  • A welding method in which a hole forms in the surface immediately ahead of the puddle in the direction of welding. The hole is filled as the weld progresses. 

verb
  • To strike a target after wobbling in flight so that the long axis of the bullet does not follow the line of flight, typically due to insufficient spin resulting from the rifling in the barrel. 

notch

noun
  • An indentation. 

  • A mountain pass; a defile. 

  • A discontinuous change in a taxation schedule. 

  • Woman. 

  • Such a cut, used for keeping a record. 

  • A level or degree. 

  • A portion of a mobile phone that overlaps the edge of the screen, used to house camera, sensors etc. while maximizing screen space. 

verb
  • To cut a notch in (something). 

  • To achieve (something); to add to one's score or record of successes. 

  • To join by means of notches. 

  • To record (a score or similar) by making notches on something. 

  • To fit (an arrow) to a bow by means of the notch cut at the end of the arrow; to nock. 

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