horsepower vs muscle

horsepower

noun
  • Strength. 

  • Power derived from the motion of a horse. 

  • A nonmetric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts. 

  • A metric unit (symbol often PS from the German abbreviation), approximately equal to 735.5 watts. 

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. 

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