retard vs thrill

retard

verb
  • To decelerate; to slow down. 

  • To put off; to postpone. 

  • 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. 

thrill

verb
  • To (cause something to) tremble or quiver. 

  • To drill and thread in one operation, using a tool bit that cuts the hole and the threads in one series of computer-controlled movements. 

  • To suddenly excite someone, or to give someone great pleasure; to (figuratively) electrify; to experience such a sensation. 

noun
  • A breathing place or hole; a nostril, as of a bird. 

  • A cause of sudden excitement; a kick. 

  • A slight quivering of the heart that accompanies a cardiac murmur. 

  • A trembling or quivering, especially one caused by emotion. 

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