above-board vs highly

above-board

adv
  • Honestly; openly. 

adj
  • In open sight; without trick, concealment, or deception. 

highly

adv
  • Extremely; greatly; very much. 

  • In a high or esteemed manner. 

How often have the words above-board and highly occurred in a corpus of books? (source: Google Ngram Viewer )