Great Britain vs tuck box

Great Britain and tuck box both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
tuck box	Yes	No	No	No

Great Britain (noun)	tuck box (noun)
an island comprising England and Scotland and Wales	a box for storing eatables (especially at boarding school)
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