sunbird vs weekender

sunbird

noun
  • A person, usually one who is retired, who travels from a warm climate to a colder one in the summer; one who oversummers elsewhere. 

  • A bird belonging to any of several species in the family Nectariniidae. 

weekender

noun
  • Someone who visits a place for a weekend break. 

  • Someone who takes part in a sport or similar event at weekends. 

  • A small liveaboard boat, suitable for short-term accommodation but not a permanent residence. 

  • An event that takes place over a weekend. 

  • A place used primarily for weekends away. 

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