disapproval vs go-ahead

disapproval

noun
  • The act of disapproving; condemnation. 

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 disapproval and go-ahead occurred in a corpus of books? (source: Google Ngram Viewer )