zenerdiode vs crystal rectifier

zenerdiode and crystal rectifier both are nouns.

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

As nouns, crystal rectifier is a hypernym of zenerdiode; that is, crystal rectifier is a word with a broader meaning than zenerdiode:

zenerdiode: a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator
crystal rectifier: a semiconductor that consists of a p-n junction

Other hypernyms of zenerdiode include diode, junction rectifier, semiconductor diode.

zenerdiode (noun)	crystal rectifier (noun)
a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator	a semiconductor that consists of a p-n junction