Synonyms for Rust (same or very similar meaning)
WordNet sense 1 (the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water):
rusting
WordNet sense 2 (any of various fungi causing rust disease in plants):
rust fungus
WordNet sense 3 (of the brown color of rust):
rusty, rust-brown
WordNet sense 4 (being or having or characterized by hue):
chromatic
WordNet sense 5 (cause to deteriorate due to the action of water, air, or an acid):
corrode, eat
From the ODE community, based on WordNet
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