incentive vs initiative

incentive

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

  • Serving to kindle or set on fire. 

noun
  • Something that motivates, rouses, or encourages. 

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

initiative

adj
  • Serving to initiate; inceptive; initiatory; introductory; preliminary. 

  • In which voter initiatives can be brought to the ballot. 

noun
  • An issue to be voted on, brought to the ballot by a sufficient number of signatures from among the voting public. 

  • A new development; a fresh approach to something; a new way of dealing with a problem. 

  • A beginning; a first move. 

  • The ability to act first or on one's own. 

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