electricity vs horsepower

electricity

noun
  • Electric power/energy as used in homes etc., supplied by power stations or generators. 

  • Originally, a property of amber and certain other nonconducting substances to attract lightweight material when rubbed, or the cause of this property; now understood to be a phenomenon caused by the distribution and movement of charged subatomic particles and their interaction with the electromagnetic field. 

  • The study of electrical phenomena; the branch of science dealing with such phenomena. 

  • A feeling of excitement; a thrill. 

horsepower

noun
  • 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. 

  • Strength. 

  • Power derived from the motion of a horse. 

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

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