high-frequency vs piping

high-frequency

adj
  • Of or pertaining to high frequency sound or other radiation. 

  • Occurring or doing something very frequently. 

piping

adj
  • High-pitched. 

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. 

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