MOT vs United Kingdom of Great Britain and Northern Ireland

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

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

MOT (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a compulsory annual test of older motor vehicles for safety and exhaust fumes	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