speech day vs United Kingdom of Great Britain and Northern Ireland

speech day and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech day	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

speech day (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
an annual day in the schools when speeches are made and prizes are distributed	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