incentive vs vulnerary

incentive

adj
  • Serving to kindle or set on fire. 

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

noun
  • Something that motivates, rouses, or encourages. 

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

vulnerary

adj
  • Useful or used for healing wounds; healing, curative. 

noun
  • A healing drug or other agent used in healing and treating wounds. 

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