town gas vs United Kingdom of Great Britain and Northern Ireland

town gas and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
town gas	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

town gas (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
coal gas manufactured for domestic and industrial use	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