duvet vs horsecloth

duvet

noun
  • A quilt or usually flat cloth bag with a filling (traditionally down) and usually an additional washable cover, used instead of blankets; often called a comforter or quilt, especially in US English. 

horsecloth

noun
  • A rug or similar cloth used to cover a horse, or as part of its trappings. 

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