retard vs shut

retard

verb
  • To put off; to postpone. 

  • To decelerate; to slow down. 

  • To keep delaying; to continue to hinder; to prevent from progressing. 

noun
  • Retardation; delay. 

  • A slowing down of the tempo; a ritardando. 

  • A person or being who is extremely stupid or slow to learn. 

shut

verb
  • To preclude; to exclude; to bar out. 

  • To confine in an enclosed area. 

  • To catch or snag in the act of shutting something. 

  • To close, to stop being open. 

  • To close, to stop from being open. 

  • To close a business temporarily, or (of a business) to be closed. 

adj
  • Closed; not open. 

noun
  • The act or time of shutting; close. 

  • The line or place where two pieces of metal are welded together. 

  • A door or cover; a shutter. 

  • A narrow alley or passage acting as a short cut through the buildings between two streets. 

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