land agent vs Great Britain

land agent and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
land agent	Yes	No	No	No
Great Britain	Yes	No	No	No

land agent (noun)	Great Britain (noun)
a person who administers a landed estate	an island comprising England and Scotland and Wales
a person who is authorized to act as an agent for the sale of land	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