rusty vs rust-brown

rusty and rust-brown both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rusty	No	Yes	No	No
rust-brown	No	Yes	No	No

As adjectives, rusty and rust-brown are synonyms defined as:

Other synonyms of rusty include rust.

rusty (adjective)	rust-brown (adjective)
of the brown color of rust	of the brown color of rust
ancient
covered with or consisting of rust
impaired in skill by neglect