bells vs go-ahead

bells

noun
  • Ship's bells; the strokes on a ship's bell, every half-hour, to mark the passage of time. 

go-ahead

noun
  • Approval, agreement, or instruction to begin or proceed. 

adj
  • Progressive; exerting leadership. 

  • Being a score which gives the scoring team or player the lead in the game. 

  • Dashing; energetic. 

How often have the words bells and go-ahead occurred in a corpus of books? (source: Google Ngram Viewer )