flagship vs holder

flagship

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

  • The most important one out of a related group. 

  • 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. 

holder

noun
  • One who is employed in the hold of a vessel. 

  • A thing that holds. 

  • A person who temporarily or permanently possesses something. 

  • The defending champion. 

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