swan's down vs swan

swan's down and swan both are nouns.

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

swan's down (noun)	swan (noun)
down of the swan	stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult
soft woolen fabric used especially for baby clothes

swan's down (verb)	swan (verb)
	to declare or affirm solemnly and formally as true
	move about aimlessly or without any destination, often in search of food or employment
	sweep majestically