prep vs retard

prep

noun
  • A student or graduate of a prep school, a preppy. 

  • A prep school. 

  • preparatory level; the last two levels or the fourth and fifth years of preschool; the two levels before first grade. 

  • Preparation. 

  • Homework, work set to do outside class time, used widely in public schools and preparatory schools but not state schools. 

verb
  • To prepare. 

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 prep and retard occurred in a corpus of books? (source: Google Ngram Viewer )