adjuvant vs incentive

adjuvant

adj
  • Helping; helpful; assisting. 

  • Designating a supplementary form of treatment, especially a cancer therapy administered after removal of a primary tumour. 

noun
  • Something that enhances the effectiveness of a medical treatment; a supplementary treatment. 

  • A substance enhancing the immune response to an antigen. 

  • Someone who helps or facilitates; an assistant, a helper. 

  • An additive (as in a drug) that aids or modifies the action of the principal ingredient. 

  • An additive (often a separate product) that enhances the efficacy of pesticide products, but has little or no pesticidal activity itself. 

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