Great Britain vs land agent

Great Britain and land agent both are nouns.

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

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