crossbench vs United Kingdom of Great Britain and Northern Ireland

crossbench and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossbench	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

crossbench (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
any of the seats in the House of Commons used by members who do not vote regularly with either the government or the Opposition	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