eating away vs eroding

eating away and eroding both are nouns.

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

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

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

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

eating 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