Xizang vs Tibet Autonomous Region

Xizang and Tibet Autonomous Region both are nouns.

Word	Noun	Adjective	Verb	Adverb
Xizang	Yes	No	No	No
Tibet Autonomous Region	Yes	No	No	No

As nouns, Xizang and Tibet Autonomous Region are synonyms defined as:

Xizang and Tibet Autonomous Region: an autonomous region of the Peoples Republic of China; located in the Himalayas

Other synonyms of Xizang include Sitsang, Thibet, Tibet.

Xizang (noun)	Tibet Autonomous Region (noun)
an autonomous region of the Peoples Republic of China; located in the Himalayas	an autonomous region of the Peoples Republic of China; located in the Himalayas