Great Britain vs pelican crossing

Great Britain and pelican crossing both are nouns.

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

Great Britain (noun)	pelican crossing (noun)
an island comprising England and Scotland and Wales	an acronym for pedestrian light control; a pedestrian crossing with traffic lights that are controlled by pedestrians
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