We don't have synonyms for rusts yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are rust, rusty and rests.
(n) :
The deteriorated state of iron or steel as a result of moisture and oxidation; it consists mostly of iron(III) oxide (ferric oxide) and iron(II) oxide (ferrous oxide).
(v) :
(intransitive) To oxidize, especially of iron or steel.
(n) :
A similar substance based on another metal.
(n) :
A reddish-brown color.
(n) :
A disease of plants caused by a reddish-brown fungus.
(v) :
(intransitive) To be affected with the parasitic fungus called rust.
(n) :
The deteriorated state of iron or steel as a result of moisture and oxidation; it consists mostly of iron(III) oxide (ferric oxide) and iron(II) oxide (ferrous oxide).
(v) :
(intransitive) To oxidize, especially of iron or steel.
(n) :
A similar substance based on another metal.
(n) :
A reddish-brown color.
(n) :
A disease of plants caused by a reddish-brown fungus.
(v) :
(intransitive) To be affected with the parasitic fungus called rust.