British Empire vs geographical region

British Empire and geographical region both are nouns.

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

British Empire (noun)	geographical region (noun)
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	a demarcated area of the Earth