heath vs United Kingdom of Great Britain and Northern Ireland

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

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

heath (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a tract of level wasteland; uncultivated land with sandy soil and scrubby vegetation	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 low evergreen shrub of the family Ericaceae; has small bell-shaped pink or purple flowers