British Empire vs British West Africa

British Empire and British West Africa both are nouns.

Word	Noun	Adjective	Verb	Adverb
British Empire	Yes	No	No	No
British West Africa	Yes	No	No	No

British Empire (noun)	British West Africa (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	the former British territories of western Africa, including Nigeria, Cameroon, Gambia, Togo, Sierra Leone, and the Gold Coast