flagship vs nub

flagship

verb
  • To act as a flagship for. 

noun
  • The most important one out of a related group. 

  • The ship occupied by the fleet's commander (usually an admiral); it denotes this by flying his flag. 

  • The ship regarded as most important out of a group, e.g. a nation's navy or company's fleet. 

nub

verb
  • To beckon. 

  • To push; to nudge. 

  • To hit the ball weakly. 

noun
  • a pointing stick 

  • The clitoris. 

  • A small lump or knob. 

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

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