cretin vs prat

cretin

noun
  • An idiot. 

  • A person who fails to develop mentally and physically due to a congenital hypothyroidism. 

prat

noun
  • A fool. 

  • A cunning or mischievous trick; a prank, a joke. 

  • The female genitals. 

  • A buttock, or the buttocks; a person's bottom. 

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