rectifier vs electrical device

rectifier and electrical device both are nouns.

Word	Noun	Adjective	Verb	Adverb
rectifier	Yes	No	No	No
electrical device	Yes	No	No	No

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

rectifier: electrical device that transforms alternating into direct current
electrical device: a device that produces or is powered by electricity

rectifier (noun)	electrical device (noun)
electrical device that transforms alternating into direct current	a device that produces or is powered by electricity
a person who corrects or sets right