incentive vs quickening

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. 

quickening

noun
  • Stimulation, excitement (of a feeling, emotion etc.). 

  • The action of bringing someone or something to life. 

  • An increase of speed. 

  • The first noticeable movements of a foetus during pregnancy, or the period when this occurs. 

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