British Isles vs British Empire

British Isles and British Empire both are nouns.

Word	Noun	Adjective	Verb	Adverb
British Isles	Yes	No	No	No
British Empire	Yes	No	No	No

British Isles (noun)	British Empire (noun)
Great Britain and Ireland and adjacent islands in the north Atlantic	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