Turkestan vs geographic region

Turkestan and geographic region both are nouns.

Word	Noun	Adjective	Verb	Adverb
Turkestan	Yes	No	No	No
geographic region	Yes	No	No	No

Turkestan (noun)	geographic region (noun)
a historical region of central Asia that was a center for trade between the East and the West	a demarcated area of the Earth