retard vs set aside

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. 

set aside

verb
  • To leave out of account; to omit or neglect. 

  • To disagree with something and reject or overturn it. 

  • To declare something invalid or null and void. 

  • To separate and reserve something for a specific purpose. 

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