sharp as a tack vs tippy

sharp as a tack

adj
  • very intelligent 

tippy

adj
  • Clever, neat, smart. 

  • Tending to tip or tilt over; unstable. 

  • Of tea, having a large amount of tips, or leaf buds. 

How often have the words sharp as a tack and tippy occurred in a corpus of books? (source: Google Ngram Viewer )