Great Britain vs parliament

Great Britain and parliament both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
parliament	Yes	No	No	No

Great Britain (noun)	parliament (noun)
an island comprising England and Scotland and Wales	a card game in which you play your sevens and other cards in sequence in the same suit as the sevens; you win if you are the first to use all your cards
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 legislative assembly in certain countries