geographic region vs Caledonia

geographic region and Caledonia both are nouns.

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

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