pelican crossing vs Great Britain

pelican crossing and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
pelican crossing	Yes	No	No	No
Great Britain	Yes	No	No	No

pelican crossing (noun)	Great Britain (noun)
an acronym for pedestrian light control; a pedestrian crossing with traffic lights that are controlled by pedestrians	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