crystal rectifier vs diode

crystal rectifier and diode both are nouns.

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

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

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

Other synonyms of crystal rectifier include junction rectifier, semiconductor diode.

crystal rectifier (noun)	diode (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