Claret vs sweetheart

Claret

noun
  • someone connected with Burnley Football Club, as a fan, player, coach etc. 

sweetheart

noun
  • A person who is always very kind. 

  • A person very much liked or loved by someone, especially when both partners are young. 

  • A female member of a college or university fraternity. 

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