err vs swan

err is not a noun while swan is a noun.

Word	Noun	Adjective	Verb	Adverb
err	No	No	Yes	No
swan	Yes	No	Yes	No

err (noun)	swan (noun)
	stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult

err (verb)	swan (verb)
to make a mistake or be incorrect	to declare or affirm solemnly and formally as true
wander from a direct course or at random	move about aimlessly or without any destination, often in search of food or employment
	sweep majestically