eiderdown vs pourpoint

eiderdown

noun
  • A quilt stuffed with this down. 

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

pourpoint

noun
  • A quilted military doublet or gambeson worn in the 14th and 15th centuries. 

  • A doublet of the 16th and 17th centuries worn by civilians. 

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