caput vs flagship

caput

noun
  • The top or superior part of a thing. 

  • A knob-like protuberance or capitulum. 

  • The head. 

  • The council or ruling body of the University of Cambridge prior to the constitution of 1856. 

flagship

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. 

verb
  • To act as a flagship for. 

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