darling vs lovebird

darling

noun
  • A kind or sweet person; sweetheart. 

  • An affectionate term of address. 

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

  • A person who is dear to one. 

adj
  • Dear; cherished. 

  • charming 

lovebird

noun
  • One of the members of an openly affectionate couple. 

  • Any small parrot from one of the nine species within the genus Agapornis. Sometimes they are kept as cage birds and are noted for their affection towards each other. 

verb
  • To express romantic affection openly. 

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