red-brick vs UK

red-brick is not a noun while UK is a noun.

Word	Noun	Adjective	Verb	Adverb
red-brick	No	Yes	No	No
UK	Yes	No	No	No

red-brick (noun)	UK (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

red-brick (adjective)	UK (adjective)
of or relating to British universities founded in the late 19th century or the 20th century