newsreader vs Great Britain

newsreader and Great Britain both are nouns.

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

newsreader (noun)	Great Britain (noun)
someone who reads out broadcast news bulletin	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