pedal vs stompbox

pedal

noun
  • A lever operated by one's foot that is used to control or power a machine or mechanism, such as a bicycle or piano 

  • The ranks of pipes played from the pedal-board of an organ. 

  • an orthopedic structure or a footlike part. 

  • An effects unit, especially one designed to be activated by being stepped on. 

  • A stirrup. 

adj
  • Of or relating to the foot. 

verb
  • To operate a pedal attached to a wheel in a continuous circular motion. 

  • To operate a bicycle. 

stompbox

noun
  • A guitar effect unit which can be controlled with the foot 

  • A simple percussion instrument consisting of a small wooden box placed under the foot, which is tapped or stamped on rhythmically to produce a sound similar to that of a bass drum. 

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