thermionic vacuum tube vs thermionic valve

thermionic vacuum tube and thermionic valve both are nouns.

Word	Noun	Adjective	Verb	Adverb
thermionic vacuum tube	Yes	No	No	No
thermionic valve	Yes	No	No	No

As nouns, thermionic vacuum tube and thermionic valve are synonyms defined as:

thermionic vacuum tube and thermionic valve: electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Other synonyms of thermionic vacuum tube include electron tube, thermionic tube, tube, vacuum tube.

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