Rust is a noun. However, when used with an object it is a verb (to make rust coloured). It can be an adjective (having the rust colour).
The word "rusty" can function as an adjective, describing something as covered in rust or in a state of disrepair.
The word rusty is an adjective. It describes something that has been affected by rust.
Rust is of 2 types . Rust on iron is part of chemistry while rust on cereal crops is part of Fungi or Biology .
lighter
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The part of speech for "indefinite" is an adjective.
The part of speech for "buried" is a verb.