bugle vs euphonium

bugle

noun
  • A simple brass instrument consisting of a horn with no valves, playing only pitches in its harmonic series 

  • A sort of wild ox; a buffalo. 

  • A plant in the family Lamiaceae grown as a ground cover Ajuga reptans, and other plants in the genus Ajuga. 

  • A tubular glass or plastic bead sewn onto clothes as a decorative trim 

  • A horn used by hunters. 

  • Anything shaped like a bugle, round or conical and having a bell on one end. 

  • The sound of something that bugles. 

verb
  • To announce, sing, or cry in the manner of a musical bugle. 

euphonium

noun
  • A valved brass instrument with conical tubing similar in appearance to a tuba but of higher pitch; a sax horn. 

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