thermionic tube vs circuit

thermionic tube and circuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
thermionic tube	Yes	No	No	No
circuit	Yes	No	Yes	No

thermionic tube (noun)	circuit (noun)
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope	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

thermionic tube (verb)	circuit (verb)
	make a circuit