Great Britain vs tallyman

Great Britain and tallyman both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
tallyman	Yes	No	No	No

Great Britain (noun)	tallyman (noun)
an island comprising England and Scotland and Wales	one who keeps a tally of quantity or weight of goods produced or shipped or received
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	one who sells goods on the installment plan