peppercorn rent vs Great Britain

peppercorn rent and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
peppercorn rent	Yes	No	No	No
Great Britain	Yes	No	No	No

peppercorn rent (noun)	Great Britain (noun)
very low or nominal rent	an island comprising England and Scotland and Wales
	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