Transcaucasia vs geographic region

Transcaucasia and geographic region both are nouns.

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

Transcaucasia (noun)	geographic region (noun)
a geographical region to the south of the Caucasus Mountains and to the north of Turkey that comprises Georgia and Armenia and Azerbaijan	a demarcated area of the Earth