geographical region vs Austria-Hungary

geographical region and Austria-Hungary both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
Austria-Hungary	Yes	No	No	No

geographical region (noun)	Austria-Hungary (noun)
a demarcated area of the Earth	a geographical area in central and eastern Europe; broken into separate countries at the end of World War I