err vs error

err is not a noun while error is a noun.

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

err (noun)	error (noun)
	a wrong action attributable to bad judgment or ignorance or inattention
	(baseball) a failure of a defensive player to make an out when normal play would have sufficed
	inadvertent incorrectness
	departure from what is ethically acceptable
	a misconception resulting from incorrect information
	part of a statement that is not correct
	(computer science) the occurrence of an incorrect result produced by a computer

err (verb)	error (verb)
to make a mistake or be incorrect
wander from a direct course or at random