roly-poly vs United Kingdom of Great Britain and Northern Ireland

roly-poly and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
roly-poly	Yes	Yes	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

roly-poly (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
pudding made of suet pastry spread with jam or fruit and rolled up and baked or steamed	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 rotund individual

roly-poly (adjective)	United Kingdom of Great Britain and Northern Ireland (adjective)
short and plump