eroding vs eating away

eroding and eating away both are nouns.

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

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

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

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

eroding (noun)	eating away (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