impressive vs incentive

impressive

adj
  • Making, or tending to make, a positive impression; having power to impress 

  • Appealing. 

  • Capable of being impressed. 

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. 

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