error vs err

error is a noun but err is not a noun.

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

error (noun)	err (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

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