tart vs United Kingdom of Great Britain and Northern Ireland

tart and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
tart	Yes	Yes	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

tart (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a small open pie with a fruit filling	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 pastry cup with a filling of fruit or custard and no top crust
a woman who engages in sexual intercourse for money

tart (adjective)	United Kingdom of Great Britain and Northern Ireland (adjective)
tasting sour like a lemon
harsh