nub vs talking point

nub

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

  • a pointing stick 

  • The clitoris. 

  • A small lump or knob. 

verb
  • To push; to nudge. 

  • To beckon. 

  • To hit the ball weakly. 

talking point

noun
  • A specific topic raised in a conversation or argument which is intended as a basis for further discussion, especially one which represents a point of view. 

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