batt vs eiderdown

batt

noun
  • Pieces of fabric or fibre used for stuffing; as for batting or insulation 

  • A shoe. 

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 batt and eiderdown occurred in a corpus of books? (source: Google Ngram Viewer )