bedlinen vs covers

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. 

covers

noun
  • The bedclothes; collectively, the sheets, blankets, etc. 

  • The tarpaulins or other devices used to cover the wicket during rain, in order to prevent it getting wet. 

  • The area of the field near cover and extra cover. 

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