UK vs mod

UK and mod both are nouns.

Word	Noun	Adjective	Verb	Adverb
UK	Yes	No	No	No
mod	Yes	Yes	No	No

UK (noun)	mod (noun)
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	a British teenager or young adult in the 1960s; noted for their clothes consciousness and opposition to the rockers

UK (adjective)	mod (adjective)
	relating to a recently developed fashion or style