coot vs woolly back

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. 

woolly back

noun
  • Any unsophisticated person from the countryside. 

  • A New Zealander. 

  • A non-Liverpudlian person who travels to Liverpool, especially to work at the docks. 

  • A Welsh person. 

  • A person from the area surrounding Liverpool such as Skelmersdale, St. Helens, Southport, Wigan, Widnes, and the Wirral. 

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