nan vs United Kingdom of Great Britain and Northern Ireland

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

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

nan (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
leavened bread baked in a clay oven in India; usually shaped like a teardrop	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
your grandmother
the mother of your father or mother