ranker vs United Kingdom of Great Britain and Northern Ireland

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

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

ranker (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
an enlisted soldier who serves in the ranks of the armed forces	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
a commissioned officer who has been promoted from enlisted status