United Kingdom of Great Britain and Northern Ireland vs crossbench

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

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

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