axon vs muscle

axon

noun
  • A nerve fibre which is a long slender projection of a nerve cell, and which conducts nerve impulses away from the body of the cell to a synapse. 

muscle

noun
  • A contractile form of tissue which animals use to effect movement. 

  • Strength, force. 

  • Hired strongmen or bodyguards. 

  • An organ composed of muscle tissue. 

  • A well-developed physique, in which the muscles are enlarged from exercise. 

verb
  • To use force to make progress, especially physical force. 

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