fire watcher vs Great Britain

fire watcher and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
fire watcher	Yes	No	No	No
Great Britain	Yes	No	No	No

fire watcher (noun)	Great Britain (noun)
(during World War II in Britain) someone whose duty was to watch for fires caused by bombs dropped from the air	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