libido vs urge

libido

noun
  • Sexual urges or drives. 

  • Drives or mental energies related to or based on sexual instincts but not necessarily sexual in and of themselves. 

  • Synonym of albedo in terms of a planet's, such as that of Mars, average surface spectral reflectivity. 

urge

noun
  • A strong desire; an itch to do something. 

verb
  • To press; to push; to drive; to impel; to force onward. 

  • To present in an urgent manner; to insist upon. 

  • To put mental pressure on; to ply with motives, arguments, persuasion, or importunity. 

  • To press onward or forward. 

  • To be pressing in argument; to insist; to persist. 

  • To provoke; to exasperate. 

  • To press hard upon; to follow closely. 

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