out of practice vs rusty

out of practice and rusty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
out of practice	No	Yes	No	No
rusty	No	Yes	No	No

As adjectives, out of practice and rusty are synonyms defined as:

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