clear-out vs riddance

clear-out

noun
  • The act of emptying a room or space. 

  • A semicircular sweep with the ball grasped firmly in both hands. 

riddance

noun
  • The act of being rid of something; deliverance 

  • The earth thrown up by a burrowing animal. 

How often have the words clear-out and riddance occurred in a corpus of books? (source: Google Ngram Viewer )