medium wave vs United Kingdom of Great Britain and Northern Ireland

medium wave and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
medium wave	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

medium wave (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kilohertz and 3000 kilohertz)	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