nub vs paperweight

nub

noun
  • A small lump or knob. 

  • a pointing stick 

  • The clitoris. 

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

verb
  • To push; to nudge. 

  • To beckon. 

  • To hit the ball weakly. 

paperweight

noun
  • A small, decorative, somewhat weighty object placed on one or more pieces of paper to keep them from fluttering away. 

  • Any object used for this purpose. 

  • A useless piece of equipment. 

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