UK vs SAS

UK and SAS both are nouns.

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

UK (noun)	SAS (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 specialist regiment of the British army that is trained in commando techniques of warfare and used in clandestine operations (especially against terrorist groups)