life office vs United Kingdom of Great Britain and Northern Ireland

life office and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
life office	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

life office (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
life assurance office	a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom