Great Britain vs redcap

Great Britain and redcap both are nouns.

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

Great Britain (noun)	redcap (noun)
an island comprising England and Scotland and Wales	a porter who helps passengers with their baggage at a railroad station
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 member of the military police in Britain