bird sanctuary vs aviary

bird sanctuary and aviary both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird sanctuary	Yes	No	No	No
aviary	Yes	No	No	No

As nouns, bird sanctuary and aviary are synonyms defined as:

Other synonyms of bird sanctuary include volary.

bird sanctuary (noun)	aviary (noun)
a building where birds are kept	a building where birds are kept