electron tube vs vacuum tube

electron tube and vacuum tube both are nouns.

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

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

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

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

electron tube (noun)	vacuum 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