corrosion vs rusting

corrosion and rusting both are nouns.

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

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

corrosion: 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 corrosion include indentation, pitting, roughness, rust.

corrosion (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
a state of deterioration in metals caused by oxidation or chemical action