boff vs coot

boff

noun
  • A great success; a hit. 

  • A pupil who works hard; a swot. 

  • A line in a film etc that elicits such a laugh. 

  • A big laugh. 

  • A hit or smack. 

verb
  • to have sexual intercourse (with someone) 

  • To hit; to strike. 

coot

noun
  • A success; something excellent. 

  • Body louse (Pediculus humanus). 

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

  • A foolish or eccentric fellow 

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