Great Britain vs fire watching

Great Britain and fire watching both are nouns.

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

Great Britain (noun)	fire watching (noun)
an island comprising England and Scotland and Wales	(during World War II in Britain) watching for fires started by bombs that dropped from the sky
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