edging vs purfling

edging

noun
  • The operation of shaping or dressing the edge of anything, as of a piece of metal. 

  • A technique involving the placement of the edge of the climbing shoe on a sharp hold. 

  • Anything that forms, defines, or marks the edge of something. 

  • The sexual technique of maintaining a high level of sexual arousal for an extended period of time without reaching orgasm. 

purfling

noun
  • An ornament consisting of a bordure of ermines, furs, etc. or gold studs or mountings. 

  • Two or more very narrow strips of black wood enclosing a lighter-coloured strip of wood set close to the edge of the top and back of a string instrument such as a violin, cello or a guitar, following its outline, or this effect simulated with paint. 

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