rusty vs hoary

rusty and hoary both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rusty	No	Yes	No	No
hoary	No	Yes	No	No

As adjectives, rusty and hoary are synonyms defined as:

rusty (adjective)	hoary (adjective)
of the brown color of rust	covered with fine whitish hairs or down
ancient	ancient
covered with or consisting of rust	showing characteristics of age, especially having grey or white hair
impaired in skill by neglect