eating away vs geologic process

eating away and geologic process both are nouns.

Word	Noun	Adjective	Verb	Adverb
eating away	Yes	No	No	No
geologic process	Yes	No	No	No

As nouns, geologic process is a hypernym of eating away; that is, geologic process is a word with a broader meaning than eating away:

eating away: (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively
geologic process: (geology) a natural process whereby geological features are modified

Other hypernyms of eating away include geological process.

eating away (noun)	geologic process (noun)
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively	(geology) a natural process whereby geological features are modified