beach erosion vs eroding

beach erosion and eroding both are nouns.

Word	Noun	Adjective	Verb	Adverb
beach erosion	Yes	No	No	No
eroding	Yes	No	No	No

As nouns, eroding is a hypernym of beach erosion; that is, eroding is a word with a broader meaning than beach erosion:

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

Other hypernyms of beach erosion include eating away, erosion, wearing, wearing away.

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