ranker vs Great Britain

ranker and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
ranker	Yes	No	No	No
Great Britain	Yes	No	No	No

ranker (noun)	Great Britain (noun)
an enlisted soldier who serves in the ranks of the armed forces	an island comprising England and Scotland and Wales
a commissioned officer who has been promoted from enlisted status	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