busk vs nub

busk

noun
  • A corset. 

  • A strip of metal, whalebone, wood, or other material, worn in the front of a corset to stiffen it. 

verb
  • To solicit money by entertaining the public in the street or in public transport. 

  • To tack, cruise about. 

nub

noun
  • The clitoris. 

  • a pointing stick 

  • A small lump or knob. 

  • The essence or core of an issue, argument etc. 

verb
  • To push; to nudge. 

  • To beckon. 

  • To hit the ball weakly. 

How often have the words busk and nub occurred in a corpus of books? (source: Google Ngram Viewer )