Transcaucasia vs geographical region

Transcaucasia and geographical region both are nouns.

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

Transcaucasia (noun)	geographical 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