connoisseur vs nub

connoisseur

noun
  • A specialist in a given field whose opinion is highly valued, especially in one of the fine arts or in matters of taste. 

nub

noun
  • a pointing stick 

  • The clitoris. 

  • 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 connoisseur and nub occurred in a corpus of books? (source: Google Ngram Viewer )