gnaw vs erode

gnaw and erode both are verbs.

Word	Noun	Adjective	Verb	Adverb
gnaw	No	No	Yes	No
erode	No	No	Yes	No

As verbs, gnaw and erode are synonyms defined as:

Other synonyms of gnaw include eat at, gnaw at, wear away.

gnaw (verb)	erode (verb)
become ground down or deteriorate	remove soil or rock
bite or chew on with the teeth	become ground down or deteriorate