beach chair vs sofa

beach chair

noun
  • A special chair designed to provide comfort and protection from sun, wind, rain, and sand on beaches frequented by tourists. 

sofa

noun
  • An upholstered seat with a raised back and one or two raised ends, long enough to comfortably accommodate two or more people. 

verb
  • To seat or lay down on a sofa. 

  • To furnish with one or more sofas. 

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