Great Britain vs Hooray Henry

Great Britain and Hooray Henry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
Hooray Henry	Yes	No	No	No

Great Britain (noun)	Hooray Henry (noun)
an island comprising England and Scotland and Wales	a lively and ineffectual upper-class young man
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