Great Britain vs newsreader

Great Britain and newsreader both are nouns.

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

Great Britain (noun)	newsreader (noun)
an island comprising England and Scotland and Wales	someone who reads out broadcast news bulletin
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