kindle vs retard

kindle

adj
  • pregnant 

verb
  • To arouse or inspire (a passion, etc). 

  • To begin to grow or take hold. 

  • To start (a fire) or light (a torch, a match, coals, etc.). 

  • To bring forth young; to give birth. 

noun
  • A group of kittens. 

retard

noun
  • Retardation; delay. 

  • A slowing down of the tempo; a ritardando. 

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

verb
  • To put off; to postpone. 

  • To decelerate; to slow down. 

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

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