bedcover vs eiderdown

bedcover

noun
  • A decorative cover for a bed; a bedspread or counterpane 

eiderdown

noun
  • A quilt stuffed with this down. 

  • The down of the eider duck, used for stuffing pillows and quilts. 

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