crystal rectifier vs semiconductor diode

crystal rectifier and semiconductor diode both are nouns.

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

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

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

Other synonyms of crystal rectifier include diode, junction rectifier.

crystal rectifier (noun)	semiconductor diode (noun)
a semiconductor that consists of a p-n junction	a semiconductor that consists of a p-n junction