Togal / Bitogal

Togal (pronounce as To-gal) - is a noun for rust
Bitogal (pronouns as Bi-to-gal) - is an adjective to describe rusted object.

An example below:

Togal is the rust itself that eat through the metal
Bitogal describe the condition of the metal is rusting

Example:

Sape mun bitogal bosi noh - loosely translated as "The metal is badly rusted"