clarinet vs oboe

clarinet

noun
  • A woodwind musical instrument that has a distinctive liquid tone whose characteristics vary among its three registers: chalumeau (low), clarion (medium), and altissimo (high). 

oboe

noun
  • A soprano and melody wind instrument in the modern orchestra and wind ensemble. It is a smaller instrument and generally made of grenadilla wood. It is a member of the double reed family. 

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