different between bedspread vs eiderdown

English

bed +? spread

bedspread (plural bedspreads)

eider +? down

eiderdown (countable and uncountable, plural eiderdowns)

(uncountable) The down of the eider duck, used for stuffing pillows and quilts.
- 1929, Robert Dean Frisbee, The Book of Puka-Puka (republished by Eland, 2019; p. 80):
  A great sea lifted us high and, crashing down with a deafening roar, carried us swiftly along on light foam as soft as eiderdown.
(countable) A quilt stuffed with this down.
- 1919, W. Somerset Maugham, The Moon and Sixpence, ch. 11
  I entered. It was a very small room, overcrowded with furniture of the style which the French know as Louis Philippe. There was a large wooden bedstead on which was a billowing red eiderdown, and there was a large wardrobe, a round table, a very small washstand, and two stuffed chairs covered with red rep.
- 1851, Herman Melville, Moby Dick, chapter 3
  The landlord was near spraining his wrist, and I told him for heaven’s sake to quit—the bed was soft enough to suit me, and I did not know how all the planing in the world could make eider down of a pine plank.

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