kapok vs upholstery

kapok

noun
  • A silky fibre obtained from seed pods of the silk-cotton tree (Ceiba pentandra) used for insulation and stuffing for mattresses, pillows, etc. 

  • A cotton tree, Malabar silk-cotton tree, or red silk-cotton tree (Bombax ceiba). 

  • A silk-cotton tree (Ceiba pentandra). 

upholstery

noun
  • The materials used in upholstering furniture. 

  • The craft or business of upholstering furniture. 

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