circuit vs relay

circuit and relay both are nouns.

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

circuit (noun)	relay (noun)
a journey or route all the way around a particular place or area	the act of passing something along from one person or group to another
movement once around a course	electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit
an electrical device that provides a path for electrical current to flow	a race between teams; each member runs or swims part of the distance
a racetrack for automobile races	a crew of workers who relieve another crew
(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	a fresh team to relieve weary draft animals
an established itinerary of venues or events that a particular group of people travel to
the boundary line encompassing an area or object

circuit (verb)	relay (verb)
make a circuit	pass along
	control or operate by relay