triode vs electron tube

triode and electron tube both are nouns.

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

As nouns, electron tube is a hypernym of triode; that is, electron tube is a word with a broader meaning than triode:

triode: a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible
electron tube: electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Other hypernyms of triode include thermionic tube, thermionic vacuum tube, thermionic valve, tube, vacuum tube.

triode (noun)	electron tube (noun)
a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible	electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope