What is another word for down feather?
Pronunciation: [dˌa͡ʊn fˈɛðə] (IPA) 
The term "down feather" typically refers to the soft, fluffy feathers that grow on the underside of ducks and geese. Some synonyms for this term include undercoat, fluff, floss, and plumule. Additionally, the term "down" can also be used to describe feather-filled bedding and clothing items that are warm and cozy. Synonyms for this use of the term include comforter, duvet, quilt, and eiderdown. These terms all describe items that are made with the soft, insulating feathers of ducks and geese and are prized for their warmth and comfort.
