incentive vs urge

incentive

noun
  • Something that motivates, rouses, or encourages. 

  • A bonus or reward, often monetary, to work harder. 

adj
  • Inciting; encouraging or moving; rousing to action; stimulating. 

  • Serving to kindle or set on fire. 

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 incentive and urge occurred in a corpus of books? (source: Google Ngram Viewer )