swan's down vs fabric

swan's down and fabric both are nouns.

Word	Noun	Adjective	Verb	Adverb
swan's down	Yes	No	No	No
fabric	Yes	No	No	No

As nouns, fabric is a hypernym of swan's down; that is, fabric is a word with a broader meaning than swan's down:

swan's down: soft woolen fabric used especially for baby clothes
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of swan's down include cloth, material, textile.

swan's down (noun)	fabric (noun)
down of the swan	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
soft woolen fabric used especially for baby clothes	the underlying structure