Great Britain vs slip coach

Great Britain and slip coach both are nouns.

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

Great Britain (noun)	slip coach (noun)
an island comprising England and Scotland and Wales	a railway car at the end of the train; it can be detached without stopping the train
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