muscle vs stalwartness

muscle

noun
  • Strength, force. 

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

  • 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. 

stalwartness

noun
  • The state or condition of being stalwart. 

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