rectifying tube vs rectifying valve

rectifying tube and rectifying valve both are nouns.

Word	Noun	Adjective	Verb	Adverb
rectifying tube	Yes	No	No	No
rectifying valve	Yes	No	No	No

As nouns, rectifying tube and rectifying valve are synonyms defined as:

rectifying tube and rectifying valve: a thermionic tube having two electrodes; used as a rectifier

Other synonyms of rectifying tube include diode.

rectifying tube (noun)	rectifying valve (noun)
a thermionic tube having two electrodes; used as a rectifier	a thermionic tube having two electrodes; used as a rectifier