erode vs wear away

erode and wear away both are verbs.

Word	Noun	Adjective	Verb	Adverb
erode	No	No	Yes	No
wear away	No	No	Yes	No

As verbs, erode and wear away are synonyms defined as:

Other synonyms of erode include eat at, gnaw, gnaw at.

erode (verb)	wear away (verb)
remove soil or rock	become ground down or deteriorate
become ground down or deteriorate	diminish, as by friction
	cut away in small pieces