coot vs prat

coot

noun
  • A foolish or eccentric fellow 

  • Body louse (Pediculus humanus). 

  • A success; something excellent. 

  • Any of various aquatic birds of the genus Fulica that are mainly black with a prominent frontal shield on the forehead. 

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 coot and prat occurred in a corpus of books? (source: Google Ngram Viewer )