rusty vs out of practice

rusty and out of practice both are adjectives.

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

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

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