a tad vs above-board

a tad

adv

  • Very. 

  • A lot. 

  • To a small extent; in a small amount. 

  • Slightly; rather. 

above-board

adv

  • Honestly; openly. 

adj

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

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