United Kingdom of Great Britain and Northern Ireland vs local authority

United Kingdom of Great Britain and Northern Ireland and local authority both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
local authority	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	local authority (noun)
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	an administrative unit of local government