assent vs go-ahead

assent

noun
  • agreement; act of agreeing 

verb
  • To agree to a proposal. 

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