erode vs gnaw

erode and gnaw both are verbs.

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

As verbs, erode and gnaw are synonyms defined as:

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

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