extra point vs slog

extra point

noun
  • A point scored after a touchdown by kicking the ball through the goal posts or by advancing to the end zone. 

slog

noun
  • An aggressive shot played with little skill. 

  • A long, tedious walk, or session of work. 

verb
  • To strike something with a heavy blow, especially a ball with a bat. 

  • To work slowly and deliberately at a tedious task. 

  • To walk slowly, encountering resistance. 

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