ditz vs prat

ditz

noun
  • A scatterbrained person, especially a woman. 

prat

noun
  • The female genitals. 

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

  • A fool. 

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

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