err vs vagabond

err is not a noun while vagabond is a noun.

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

err (noun)	vagabond (noun)
	anything that resembles a vagabond in having no fixed place
	a wanderer who has no established residence or visible means of support

err (adjective)	vagabond (adjective)
	continually changing especially as from one abode or occupation to another
	wandering aimlessly without ties to a place or community

err (verb)	vagabond (verb)
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