slip carriage vs Great Britain

slip carriage and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
slip carriage	Yes	No	No	No
Great Britain	Yes	No	No	No

slip carriage (noun)	Great Britain (noun)
a railway car at the end of the train; it can be detached without stopping the train	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