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).
Rusty is an adjective derived from the noun rust.
The word rusty is an adjective. It describes something that has been affected by rust.
lighter
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.