slip carriage vs United Kingdom

slip carriage and United Kingdom both are nouns.

Word	Noun	Adjective	Verb	Adverb
slip carriage	Yes	No	No	No
United Kingdom	Yes	No	No	No

slip carriage (noun)	United Kingdom (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