corroding vs rusting

corroding and rusting both are nouns.

Word	Noun	Adjective	Verb	Adverb
corroding	Yes	No	No	No
rusting	Yes	No	No	No

As nouns, rusting is a hyponym of corroding; that is, rusting is a word with a more specific, narrower meaning than corroding:

corroding: erosion by chemical action
rusting: the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water

Other hyponyms of corroding include indentation, pitting, roughness, rust.

corroding (noun)	rusting (noun)
erosion by chemical action	the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water