Great Britain vs office-bearer

Great Britain and office-bearer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
office-bearer	Yes	No	No	No

Great Britain (noun)	office-bearer (noun)
an island comprising England and Scotland and Wales	the person who holds an office
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