Great Britain vs capital

Great Britain and capital both are nouns.

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

Great Britain (noun)	capital (noun)
an island comprising England and Scotland and Wales	the upper part of a column that supports the entablature
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	one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis
	a seat of government
	a center that is associated more than any other with some activity or product
	wealth in the form of money or property owned by a person or business and human resources of economic value
	assets available for use in the production of further assets