LED vs junction rectifier

LED and junction rectifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
LED	Yes	No	No	No
junction rectifier	Yes	No	No	No

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

LED: diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used
junction rectifier: a semiconductor that consists of a p-n junction

Other hypernyms of LED include crystal rectifier, diode, semiconductor diode.

LED (noun)	junction rectifier (noun)
diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used	a semiconductor that consists of a p-n junction