United Kingdom vs local authority

United Kingdom and local authority both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom	Yes	No	No	No
local authority	Yes	No	No	No

United Kingdom (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