flagship vs specialty

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. 

specialty

noun
  • That in which one specializes; a chosen expertise or talent. 

  • A particular or peculiar case. 

  • An attribute or quality peculiar to a species. 

  • A contract or obligation under seal; a contract by deed; a writing, under seal, given as security for a debt particularly specified. 

  • A product that originates in and is characteristic of a place. 

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