chesterfield vs futon

chesterfield

noun
  • A couch, sofa, or love seat with padded arms and back of the same height, often curved outward at the top. 

  • Any couch or sofa. 

futon

noun
  • A specific kind of sofa-bed, with a fixed cushion that forms a mattress when folded down and a sofa when folded up. 

  • A round cushion used for Zen meditation, traditionally made of woven bulrush leaves. 

  • A thin mattress of tufted cotton or similar material, placed on a floor or on a raised, foldable frame as a bed. 

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