diode vs rectifying tube

diode and rectifying tube both are nouns.

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

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

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

Other synonyms of diode include rectifying valve.

diode (noun)	rectifying tube (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