retard vs suspend

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. 

suspend

verb
  • To halt something temporarily. 

  • To bring a solid substance, usually in powder form, into suspension in a liquid. 

  • To discontinue or interrupt a function, task, position, or event. 

  • To remove the value of an unused coupon from an air ticket, typically so as to allow continuation of the next sectors' travel. 

  • To hold in an undetermined or undecided state. 

  • To hang freely; underhang. 

  • To support in a liquid, as an insoluble powder, by stirring, to facilitate chemical action. 

  • To debar, or cause to withdraw temporarily, from any privilege, from the execution of an office, from the enjoyment of income, etc. 

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