Great Britain vs plimsoll

Great Britain and plimsoll both are nouns.

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

Great Britain (noun)	plimsoll (noun)
an island comprising England and Scotland and Wales	a light gym shoe with a rubber sole and a canvas top
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