pelican crossing vs United Kingdom of Great Britain and Northern Ireland

pelican crossing and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
pelican crossing	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

pelican crossing (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
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