UK vs slip carriage

UK and slip carriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
UK	Yes	No	No	No
slip carriage	Yes	No	No	No

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