retard vs revive

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. 

revive

verb
  • To raise from coma, languor, depression, or discouragement; to bring into action after a suspension. 

  • To recover from a state of oblivion, obscurity, neglect, or depression. 

  • To renew in the mind or memory; to bring to recollection; to recall attention to; to reawaken. 

  • To restore or reduce to its natural or metallic state 

  • To return to life; to cause to recover life or strength; to cause to live anew, or to prevent from dying. 

  • To restore, or bring again to life; to reanimate; to make lively again. 

  • To return to life; to become reanimated or reinvigorated. 

  • To recover its natural or metallic state (e.g. a metal) 

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