United Kingdom of Great Britain and Northern Ireland vs Poppy Day

United Kingdom of Great Britain and Northern Ireland and Poppy Day both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
Poppy Day	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	Poppy Day (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 Sunday nearest to November 11 when those who died in World War I and World War II are commemorated