diode vs crystal rectifier

diode and crystal rectifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
diode	Yes	No	No	No
crystal rectifier	Yes	No	No	No

As nouns, diode and crystal rectifier are synonyms defined as:

diode and crystal rectifier: a semiconductor that consists of a p-n junction

Other synonyms of diode include junction rectifier, semiconductor diode.

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