bedlinen vs duvet

bedlinen

noun
  • The items of cloth used to make up a bed, such as sheets and pillowcases, formerly made of linen but now manufactured in a wide variety of material such as cotton or polyester. 

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. 

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