slip coach vs Britain

slip coach and Britain both are nouns.

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

slip coach (noun)	Britain (noun)
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