wearing away vs eroding

wearing away and eroding both are nouns.

Word	Noun	Adjective	Verb	Adverb
wearing away	Yes	No	No	No
eroding	Yes	No	No	No

As nouns, wearing away and eroding are synonyms defined as:

wearing away and eroding: (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively

Other synonyms of wearing away include eating away, erosion, wearing.

wearing away (noun)	eroding (noun)
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively	(geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively