rid vs scour

rid

verb
  • To free (something) from a hindrance or annoyance. 

adj
  • Released from an obligation, problem, etc. (usually followed by of). 

scour

verb
  • To remove debris and dirt (from something) by purging; to sweep along or off by a current of water. 

  • To (cause livestock to) suffer from diarrhoea or dysentery. 

  • To search an area thoroughly. 

  • To run with speed; to scurry. 

  • To clear the digestive tract (of an animal) by administering medication that induces defecation or vomiting; to purge. 

  • To move swiftly over; to brush along. 

  • To clean, polish, or wash (something) by rubbing and scrubbing it vigorously, frequently with an abrasive or cleaning agent. 

noun
  • The removal of sediment caused by swiftly moving water. 

  • A place where wool is washed to remove grease and impurities prior to processing. 

  • A place scoured out by running water, as in the bed of a stream below a waterfall. 

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