Great Britain vs gymslip

Great Britain and gymslip both are nouns.

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

Great Britain (noun)	gymslip (noun)
an island comprising England and Scotland and Wales	a sleeveless tunic worn by English girls as part of a school uniform
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