United Kingdom of Great Britain and Northern Ireland vs peppercorn rent

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	peppercorn rent (noun)
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	very low or nominal rent