UK vs circuit

UK and circuit both are nouns.

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

UK (noun)	circuit (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 journey or route all the way around a particular place or area
	movement once around a course
	an electrical device that provides a path for electrical current to flow
	a racetrack for automobile races
	(law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals
	an established itinerary of venues or events that a particular group of people travel to
	the boundary line encompassing an area or object

UK (verb)	circuit (verb)
	make a circuit