supplementary benefit vs Great Britain

supplementary benefit and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
supplementary benefit	Yes	No	No	No
Great Britain	Yes	No	No	No

supplementary benefit (noun)	Great Britain (noun)
benefits paid to bring incomes up to minimum levels established by law	an island comprising England and Scotland and Wales
	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