Caledonia vs geographic region

Caledonia and geographic region both are nouns.

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

Caledonia (noun)	geographic region (noun)
the geographical area (in Roman times) to the north of the Antonine Wall; now a poetic name for Scotland	a demarcated area of the Earth