darling vs friend girl

darling

noun
  • A person or thing very popular with a certain group. 

  • A kind or sweet person; sweetheart. 

  • An affectionate term of address. 

  • A person who is dear to one. 

adj
  • Dear; cherished. 

  • charming 

friend girl

noun
  • a female friend. 

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