circuit vs thermionic tube

circuit and thermionic tube both are nouns.

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

circuit (noun)	thermionic tube (noun)
a journey or route all the way around a particular place or area	electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
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

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