geographical region vs British Empire

geographical region and British Empire both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
British Empire	Yes	No	No	No

geographical region (noun)	British Empire (noun)
a demarcated area of the Earth	a former empire consisting of Great Britain and all the territories under its control; reached its greatest extent at the end of World War I; it included the British Isles, British West Indies, Canada, British Guiana, British West Africa, British East Africa, India, Australia, New Zealand