vacuum tube vs electron tube

vacuum tube and electron tube both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacuum tube	Yes	No	No	No
electron tube	Yes	No	No	No

As nouns, vacuum tube and electron tube are synonyms defined as:

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

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

vacuum tube (noun)	electron tube (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