lovebird vs swain

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. 

swain

noun
  • A rural lover; a male sweetheart in a pastoral setting. 

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