detain vs retardate

detain

verb
  • To put under custody. 

  • To seize goods for official purposes. 

  • To keep back or from; to withhold. 

  • To keep someone from proceeding by holding them back or making claims on their attention. 

retardate

noun
  • A retarded person; a person with retardation. 

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