motivate vs roust

motivate

verb
  • To animate; to propel; to cause to take action 

  • To provide someone with an incentive to do something; to encourage. 

roust

verb
  • To harass, to treat in a rough way. 

  • to arrest 

  • to rout out of bed; to rouse 

  • to drive strongly 

noun
  • A strong tide or current, especially in a narrow channel. 

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