local authority vs United Kingdom

local authority and United Kingdom both are nouns.

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

local authority (noun)	United Kingdom (noun)
an administrative unit of local government	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