percolate vs scour

percolate

verb
  • To drain or seep through a porous substance. 

  • To pass a liquid through a porous substance; to filter. 

  • To make (coffee) in a percolator. 

  • To spread slowly or gradually; to slowly become noticed or realised. 

noun
  • A liquid that has been percolated. 

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 percolate and scour occurred in a corpus of books? (source: Google Ngram Viewer )