encourage vs goad

encourage

verb
  • To mentally support; to motivate, give courage, hope or spirit. 

  • To spur on, strongly recommend. 

  • To foster, give help or patronage 

goad

verb
  • To encourage or stimulate. 

  • To incite or provoke. 

  • To prod with a goad. 

noun
  • That which goads or incites; a stimulus. 

  • A long, pointed stick used to prod animals. 

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