United Kingdom vs circuit

United Kingdom and circuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom	Yes	No	No	No
circuit	Yes	No	Yes	No

United Kingdom (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

United Kingdom (verb)	circuit (verb)
	make a circuit