diode vs rectifying valve

diode and rectifying valve both are nouns.

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

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

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

Other synonyms of diode include rectifying tube.

diode (noun)	rectifying valve (noun)
a semiconductor that consists of a p-n junction	a thermionic tube having two electrodes; used as a rectifier
a thermionic tube having two electrodes; used as a rectifier