United Kingdom of Great Britain and Northern Ireland vs Lord High Chancellor

United Kingdom of Great Britain and Northern Ireland and Lord High Chancellor both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
Lord High Chancellor	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	Lord High Chancellor (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	the highest officer of the Crown who is head of the judiciary and who presides in the House of Lords