err vs ramble

err is not a noun while ramble is a noun.

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

err (noun)	ramble (noun)
	an aimless amble on a winding course

err (verb)	ramble (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	continue talking or writing in a desultory manner