flageolet vs wind instrument

flageolet

noun
  • A technique for playing stringed instrument that produces high-pitched overtones. 

  • A type of small flute of the fipple family. 

  • A type of kidney bean, common in France. 

wind instrument

noun
  • Any musical instrument that produces sound when air flows through it; a woodwind instrument or brass instrument. 

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