swan vs err

swan is a noun but err is not a noun.

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

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

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