piping vs purfling

piping

noun
  • An act of making music or noise with pipes. 

  • A system of pipes that compose a structure; pipework. 

  • The process of an animal just beginning to break out of its egg; precedes hatching. 

  • The sound of musical pipes. 

  • An ornamentation on the edges of a garment; a small cord covered with cloth. 

  • Icing extruded from a piping bag. 

  • propagation by cuttings 

  • A piece cut off to be set or planted; a cutting. 

adj
  • High-pitched. 

purfling

noun
  • 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. 

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

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